Irregular ER Verbs - First Person Stem Changes

Stem Changes in the First Person Present

Some ER verbs only change their stem in the first person 'yo' form. After this, they follow the same pattern as regular ER verbs.

Hacer - to do, to make

Hago - I do.
Haces - you do.
Hace - he/she does.
Hacemos - we do.
Hacéis - you do.
Hacen - they do.

Poner - to put, to set

Pongo - I put.
Pones - you put.
Pone - he/she puts.
Ponemos - we put.
Ponéis - you put.
Ponen - they put.

Traer - to bring

Traigo - I bring.
Traes - you bring.
Trae - he/she brings.
Traemos - we bring.
Traéis - you bring.
Traen - they bring.

Caerse - to fall, collapse

me caigo - I fall.
te caes - you fall.
él/ella cae - he/she falls.
nos caemos - we fall.
vos caéis - you (plural) fall.
ellos caen - they fall.

Other common ER verbs that change in the first person

Conozco - I know (a person).
Parezco - I look like.
Agradezco - I thank.
Sé - I know (information).

Stem Changes in the First Person

Some ER verbs only change their stem in the first person 'yo' form. After this, they follow the same pattern as regular ER verbs.

Conocer - to know, meet

Conozco - I know.
Conoces - you know.
Conoce - he/she knows.
Conocemos - we know.
Conocéis - you know.
Conocen - they know.

Agradecer - to thank

Agradezco - I thank.
Agradeces - you thank.
Agradece - he/she thanks.
Agradecemos - we thank.
Agradecéis - you thank.
Agradecen - they thank.

Desaparecer - to disappear

Desaparezco - I disappear.
Desapareces - you disappear.
Desaparece - he/she disappears.
Desaparecemos - we disappear.
Desaparecéis - you disappear.
Desaparecen - they disappear.

Nacer - to be born

Nazco - I am born.
Naces - you are born.
Nace - he/she is born.
Nacemos - we are born.
Nacéis - you are born.
Nacen - they are born.

Parecer - to seem, appear

Parezco - I seem.
Pareces - you seem.
Parece - he/she/it seems.
Parecemos - we seem.
Parecéis - you seem.
Parecen - they seem.

Saber - to know

(Yo) sé - I know.
Sabes - you know.
Sabe - he/she knows.
Sabemos - we know.
Sabéis - you know.
Saben - they know.

More Irregular ER Verbs in the Preterite Tense

Illustrative background for Stem change (vowel &rightarrow; u)

Illustrative background for Stem change (vowel &rightarrow; u) ?? "content

Stem change (vowel → u)

In the preterite tense, some vowels change their root vowel to 'u', for example poner (to put), saber (to know) and poder (to be able to).
E.g. Poder:
- Pude - I was able to.
- Pudiste - you were able to.
- Pudo - he/she was able to.
- Pudimos - we were able to.
- Pudisteis - you were able to.
- Pudieron - they were able to.

Illustrative background for Stem change (vowel &rightarrow; i) - hacer (to do)

Illustrative background for Stem change (vowel &rightarrow; i) - hacer (to do) ?? "content

Stem change (vowel → i) - hacer (to do)

In the preterite tense, some vowels change their root vowel to 'i', for example, hacer (to do):
- Hice - I did.
- Hiciste - you did.
- Hizo - he/she did.
- Hicimos - we did.
- Hicisteis - you did.
- Hicieron - they did.

Illustrative background for Stem change (vowel &rightarrow; i) - querer (to want)

Illustrative background for Stem change (vowel &rightarrow; i) - querer (to want) ?? "content

Stem change (vowel → i) - querer (to want)

In the preterite tense, some vowels change their root vowel to 'i', for example, querer (to want):
- Quise - I wanted.
- Quisiste - you wanted.
- Quiso - he/she wanted.
- Quisimos - we wanted.
- Quisisteis - you wanted.
- Quisieron - they wanted.

Traer (to bring)

In the preterite tense, traer adds a 'j' to its stem.
- Traje - I brought.
- Trajiste - you (singular) brought.
- Trajo - he/she brought.
- Trajimos - we brought.
- Trajisteis - you (plural) brought.
- Trajieron - they brought.

1The Basics

1.1Pronouns

1.1.1Personal Pronouns

1.2Verbs

1.2.13 Types of Verbs

1.2.2The Infinitive

1.3Nouns

1.3.1Nouns Endings - 'O', 'A', 'OS' and 'AS'

1.3.2Other Noun Endings

1.4Adjectives

1.4.1Gender

1.4.2Position of Adjectives

1.5Abbreviations

1.5.1Common Abbreviations

1.6Time

1.6.1Time Expressions

1.6.2Time Expressions 2

1.6.3The Seasons

1.6.4Telling the Time

2Current & Future Study & Employment

2.1School & Subjects

2.1.1A Good Student

2.1.2My Studies

2.1.3Life At School

2.1.4Some Common Conjunctions

2.1.5Subjects

2.1.6Future Study

2.1.7School Routine

2.1.8Exam-Style Questions - Schools

2.2School & Subjects - Translations

2.2.1School - Spanish to English

2.2.2School - English to Spanish

2.2.3School - Translations

2.2.4Subjects - Spanish to English

2.2.5Subjects - English to Spanish

2.2.6Subjects - Translations

2.2.7School Routine - Spanish to English

2.2.8School Routine - English to Spanish

2.2.9School Routine- Translations

2.3Education Post - 16

2.3.1To Go or Not To Go to University?

2.3.2University

2.3.3Regular AR Verbs

2.3.4'Ir'

2.3.5Work

2.3.6Ideal Job

2.3.7Regular ER Verbs

2.3.8Exam-Style Questions - Ideal Job

2.4Education Post - 16 - Translations

2.4.1University - Spanish to English

2.4.2University - English to Spanish

2.4.3University - Translations

2.4.4Jobs & Careers - Spanish to English

2.4.5Jobs & Careers - English to Spanish

2.4.6Jobs & Careers - Translations

3Identity & Culture

3.1Me, My Family & Friends

3.1.1Greetings

3.1.2Age & Name

3.1.3Physical Appearance

3.1.4Friends

3.1.5Personality

3.1.6Whose Father? Whose Parents?

3.1.7Family Members

3.1.8Other Family Members

3.1.9Describing Family

3.1.10Describing People

3.1.11Exam-Style Questions - Describing People

3.1.12Exam-Style Questions - Family

3.1.13Relationships

3.1.14Exam-Style Questions - Relationships

3.1.15Tener

3.1.16Ser

3.2Me, My Family & Friends - Translations

3.2.1Greetings - Spanish to English

3.2.2Greetings - English to Spanish

3.2.3Greetings - Translations

3.2.4Age & Name - Spanish to English

3.2.5Age & Name - English to Spanish

3.2.6Age & Name - Translations

3.2.7Describing Yourself - Spanish to English

3.2.8Describing Yourself - English to Spanish

3.2.9Describing Yourself - Translations

3.2.10Friends - English to Spanish

3.2.11Friends - Spanish to English

3.2.12Friends - Translations

3.2.13Personality - Spanish to English

3.2.14Personality - English to Spanish

3.2.15Personality - Translations

3.2.16Family - Spanish to English

3.2.17Family - English to Spanish

3.2.18Family - Translations

3.2.19Describing Family - Spanish to English

3.2.20Describing Family - English to Spanish

3.2.21Describing Family - Translations

3.2.22Relationships - Spanish to English

3.2.23Relationships - English to Spanish

3.2.24Relationships - Translations

3.3Technology in Everyday Life

3.3.1Social Media

3.3.2Social Media 2

3.3.3Positives & Negatives of Social Media

3.3.4Mobile Technology

3.3.5'Para' or 'Por'

3.4Technology in Everyday Life - Translations

3.4.1Social Media - Spanish to English

3.4.2Social Media - English to Spanish

3.4.3Social Media - Translations

3.4.4Mobile Technology - Spanish to English

3.4.5Mobile Technology - English to Spanish

3.4.6Mobile Technology - Translations

3.5Free Time Activities

3.5.1Regular ER Verbs in the Imperfect

3.5.2Music

3.5.3Cinema & TV

3.5.4Exam-Style Questions - Cinema

3.5.5Food

3.5.6Meat & Fish

3.5.7Fruit & Veg

3.5.8Drinks & Snacks

3.5.9Eating Out

3.5.10Sport

3.5.11Fashion

3.5.12Exam-Style Questions - Fashion

3.6Free Time Activities - Translations

3.6.1Music - Spanish to English

3.6.2Music - English to Spanish

3.6.3Music - Translations

3.6.4Cinema & TV - Spanish to English

3.6.5Cinema & TV - English to Spanish

3.6.6Cinema & TV - Translations

3.6.7Food - Spanish to English

3.6.8Food - English to Spanish

3.6.9Food - Translations

3.6.10Meat & Fish - Spanish to English

3.6.11Meat & Fish - English to Spanish

3.6.12Meat & Fish - Translations

3.6.13Fruit & Veg - Spanish to English

3.6.14Fruit & Veg - English to Spanish

3.6.15Fruit & Veg - Translations

3.6.16Drinks & Snacks - Spanish to English

3.6.17Drinks & Snacks - English to Spanish

3.6.18Drinks & Snacks - Translations

3.6.19Eating Out - Spanish to English

3.6.20Eating Out - English to Spanish

3.6.21Eating Out - Translations

3.6.22Sport - Spanish to English

3.6.23Sport- English to Spanish

3.6.24Sport - Translations

3.6.25Fashion - Spanish to English

3.6.26Fashion - English to Spanish

3.6.27Fashion - Translations

3.7Customs & Festivals in Spanish Speaking Countries

3.7.1Customs & Festivals

3.7.2Exam-Style Questions - Festivals

3.7.3-ER and -IR Verbs

3.8Customs & Festivals - Translations

3.8.1Festivals Vocab - Spanish to English

3.8.2Festivals Vocab - English to Spanish

3.8.3Festivals - Translations

4Areas of Interest

4.1Home, Town, Neighbourhood & Region

4.1.1Home

4.1.2Near Your Home

4.1.3Shops

4.1.4Places in Town

4.1.5Town & Region

4.1.6Directions

4.1.7Exam-Style Questions - Directions

4.2Home, Town, Neighbourhood & Region - Translations

4.2.1Home - Spanish to English

4.2.2Home - English to Spanish

4.2.3Home - Translations

4.2.4Near Your Home - Spanish to English

4.2.5Near Your Home - English to Spanish

4.2.6Near Your Home - Translations

4.2.7Shops - Spanish to English

4.2.8Shops - English to Spanish

4.2.9Shops - Translations

4.2.10Places in Town - Spanish to English

4.2.11Places in Town - English to Spanish

4.2.12Places in Town - Translations

4.2.13Region & Directions - English to Spanish

4.2.14Region & Directions - Spanish to English

4.2.15Region & Directions - Translations

4.3Social Issues

4.3.1Charity Work

4.3.2Charity Work 2

4.3.3The Body

4.3.4Illness

4.3.5Recovery

4.3.6Exam-Style Questions - Illness

4.3.7A Healthy Life

4.3.8An Unhealthy Life

4.3.9Asking Questions

4.4Social Issues - Translations

4.4.1Charity - English to Spanish

4.4.2Charity - Spanish to English

4.4.3Charity - Translations

4.4.4Body & Illness - Spanish to English

4.4.5Body & Illness - English to Spanish

4.4.6Body & Illness - Translations

4.4.7Healthy Life - Spanish to English

4.4.8Healthy Life - English to Spanish

4.4.9A Healthy Life - Translations

4.5Global Issues

4.5.1The Environment

4.5.2Exam-Style Questions - Environment

4.5.3Poverty & Homelessness

4.6Global Issues - Translations

4.6.1Environment - Spanish to English

4.6.2Environment - English to Spanish

4.6.3Environment - Translations

4.6.4Poverty - Spanish to English

4.6.5Poverty - English to Spanish

4.6.6Poverty - Translations

4.7Travel & Tourism

4.7.1Holidays

4.7.2Holidays - Past Tense

4.7.3What Did You Do on Holiday?

4.7.4Exam-Style Questions - Holidays

4.7.5Making a Reservation

4.7.6Accommodation

4.7.7Tourism

4.7.8Good Weather

4.7.9Bad Weather

4.7.10Weather - Conditional Tense

4.7.11Exam-Style Questions - Weather

4.8Travel & Tourism - Translations

4.8.1Holidays - Spanish to English

4.8.2Holidays - English to Spanish

4.8.3Holidays - Translations

4.8.4Booking - Spanish to English

4.8.5Booking - English to Spanish

4.8.6Booking - Translations

4.8.7Tourism - Spanish to English

4.8.8Tourism - English to Spanish

4.8.9Tourism - Translations

4.8.10Weather - Spanish to English

4.8.11Weather - English to Spanish

4.8.12Weather - Translations

5Listening Practice

5.1Me, My Family & Friends - Listening

5.1.1Family & Friends - Listening (All)

5.1.2Family & Friends - Listening (Higher)

5.1.3Marriage & Partnerships - Listening (All)

5.1.4Marriage & Partnerships - Listening (Higher)

5.2Technology in Everyday Life - Listening

5.2.1Social Media - Listening (All)

5.2.2Social Media - Listening (Higher)

5.2.3Mobile Technology - Listening (All)

5.2.4Mobile Technology - Listening (Higher)

5.2.5Exam-Style Questions - Technology Addict

5.3Free-Time - Listening

5.3.1Music - Listening (All)

5.3.2Music - Listening (Higher)

5.3.3Cinema & TV - Listening (All)

5.3.4Cinema & TV - Listening (Higher)

5.3.5Food & Eating Out - Listening (All)

5.3.6Food & Eating Out - Listening (Higher)

5.3.7Sport - Listening (All)

5.3.8Sport - Listening (Higher)

5.3.9Exam-Style Questions - Sport

5.4Customs & Festivals - Listening

5.4.1Day of the Dead - Listening (All)

5.5Home, Town, Neighbourhood & Region - Listening

5.5.1My Neighbourhood - Listening

5.6Social Issues - Listening

5.6.1Charity & Voluntary Work

5.6.2Healthy & Unhealthy Living

5.6.3The Environment

5.6.4Exam-Style Questions - The Environment

5.6.5Poverty & Homelessness

5.7Travel & Tourism - Listening

5.7.1Tourism

5.8Education - Listening

5.8.1Life at School

5.8.2Education Post-16

5.8.3Jobs, Careers, & Ambition

6Common Tenses

6.1Present Tense

6.1.1Regular AR Verbs

6.1.25 Common AR Verbs

6.1.3Negative Verbs

6.1.4Irregular AR Verbs

6.1.5Irregular AR Verbs - Exceptions

6.1.6Regular ER Verbs

6.1.75 Common ER Verbs

6.1.8Irregular ER Verbs

6.1.9Irregular ER Verbs - First Person Stem Changes

6.1.10Regular IR Verbs

6.1.115 Common IR Verbs

6.1.12Irregular IR Verbs

6.1.13Irregular IR Verbs - Adding an Accent

6.1.14Irregular IR Verbs - Exceptions

6.1.15Irregular IR Verbs - 'Ir'

6.1.16Irregular IR Verbs - Verbs Ending in '-uir'

6.1.17Verb Phrases

6.1.18The Use of 'Se'

6.2Preterite Tense

6.2.1Regular AR Verbs

6.2.2Irregular AR Verbs

6.2.3Irregular AR Verbs 2

6.2.4Regular ER Verbs

6.2.5Irregular ER Verbs

6.2.6Irregular ER Verbs - Ver & Tener

6.2.7Irregular ER Verbs 2

6.2.8Regular IR Verbs

6.2.9Irregular IR Verbs - Preterite

6.2.10Irregular IR Verbs - Decir, Venir & Ir

6.2.11Irregular IR Verbs 3

6.3Imperfect Tense

6.3.1Regular Verbs

6.3.2Irregular Verbs

6.4Preterite vs Imperfect Tenses

6.4.1Uses

6.5Future Tense

6.5.1The Future with 'Ir'

7Important Verbs

7.1To Be - 'Ser' & 'Estar'

7.1.1Conjugation

7.1.2Uses of 'Ser'

7.1.3Uses of 'Ser' y 'Estar'

7.1.4Expressions Using 'Estar"

7.2To Like - 'Gustar'

7.2.1How to Use 'Gustar'

7.3To Have - 'Tener'

7.3.1How to Use 'Tener'

7.3.2Phrases Using 'Tener'

8Advanced Tenses

8.1The Simple Future

8.1.1Using the Simple Future

8.1.2Regular Verbs

8.1.3Irregular Verbs

8.1.4Irregular Verbs 2

8.2Conditional Tense

8.2.1Regular Verbs

8.2.2'Hacer' & 'Decir'

8.2.3Irregular Verbs

8.3Continuous Tenses

8.3.1Forming the Gerund

8.3.2Present Continuous

8.3.3Imperfect Continuous

8.4Perfect Tense

8.4.1Past Participles

8.4.2Present Perfect

8.4.3Pluperfect

8.4.4Passive Voice

8.5Present Subjunctive

8.5.1Present Subjunctive - Regular AR Verbs

8.5.2Present Subjunctive - Regular ER Verbs

8.5.3Present Subjunctive - Regular IR Verbs

8.5.4Present Subjunctive - Irregular AR Verbs

8.5.5Irregular AR Verbs 2

8.5.6Irregular AR Verbs 3

8.5.7Present Subjunctive - Irregular ER Verbs

8.5.8Irregular ER Verbs 2

8.5.9Irregular IR Verbs

8.5.10Irregular IR Verbs 2

8.5.11Irregular IR Verbs 3

8.5.12Present Subjunctive - Uses

8.6Imperfect Subjunctive

8.6.1Imperfect Subjunctive - Regular AR Verbs

8.6.2Imperfect Subjunctive - Irregular AR Verbs

8.6.3Imperfect Subjunctive - Regular ER Verbs

8.6.4Imperfect Subjunctive - Irregular ER Verbs

8.6.5Imperfect Subjunctive - Regular IR Verbs

8.6.6Imperfect Subjunctive - Irregular IR Verbs

8.7Imperative

8.7.1Positive Imperative

8.7.2Negative Imperative

8.7.3Irregular Imperatives

9Extra Grammar

9.1Articles

9.1.1Definite Article

9.1.2Uses of the Definite Article

9.1.3Indefinite Article

9.1.4Uses of the Indefinite Article

9.1.5Lo + Adjective

9.2Negatives

9.2.1Negatives

9.3Nouns

9.3.1People & Animals

9.3.2Nouns that Stay the Same

9.3.3Nouns that Only Take One Article

9.3.4Masculine vs Feminine Nouns

9.3.5Masculine Exceptions

9.3.6Feminine Exceptions

9.3.7Noun Endings that Are Usually Feminine

9.3.8Noun Endings that Are Usually Masculine

9.3.9Nouns that End in a Vowel

9.3.10Nouns that End in a Consonant

9.3.11Masculine Nouns

9.3.12Masculine & Feminine Nouns

9.4Asking Questions

9.4.1Asking Questions Without Question Words

9.4.2Question Words

9.4.3Common Questions

9.5Adjectives

9.5.1Adjectives that Change Endings

9.5.2Adjectives that Remain the Same

9.5.3'Grande' & 'Bueno'

9.5.4Plurals Ending in a Consonant (r, l, s, d etc.)

9.5.5Plurals Ending in a Vowel (a, e etc.)

9.5.6The Best, The Worst

9.5.7This, These, That and Those

9.5.8Possession Before a Noun

9.5.9Possession After a Noun

9.5.10Whose

9.5.11Indefinite

9.6Adverbs

9.6.1Adding 'Mente'

9.6.2Quantity

9.6.3Place

9.6.4Time

9.6.5Frequency

9.6.6Still & Yet

9.7Conjunctions

9.7.1What are Conjunctions?

9.7.2Some Common Conjunctions

9.7.3Connectors

9.8Pronouns

9.8.1This, These, That & Those

9.8.2Possession

9.8.3Someone, Something

9.8.4Reflexive Pronouns

9.8.5Direct Object

9.8.6After Prepositions

9.8.7'Que' & 'Quien'

9.8.8'El Que' & 'El Cual'

9.8.9'Lo Que' & 'Lo Cual'

9.9By, With, From, Of

9.9.1By, With, From, Of

9.9.2'A' & 'De'

9.9.3For - 'Para'

9.9.4For - 'Por'

9.10Verbs

9.10.1Derivatives AR Verbs

9.10.25 Common AR Derivative Verbs

9.10.35 Common ER Derivative Verbs

9.10.45 Common IR Derivative Verbs

9.10.5Reflexives AR Verbs

9.10.66 Common Reflexive AR Verbs

9.10.76 Common Reflexive ER Verbs

9.10.86 Common Reflexive IR Verbs

9.11Comparisons

9.11.1Adjectives for Comparing Things

9.11.2Adjectives that Change when Comparing

9.11.3Comparing with Adverbs

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