Present Subjunctive: Regular 'ER' Verbs
Spanish: Cambridge International GCSE, topic 10.6.2
ER Verbs in the Present Subjunctive
To form the present subjunctive with ER verbs, take the present tense endings of AR verbs instead of the ER present endings. The first person singular will be the same as the third person singular. Here is the example for 'beber':

Beba - I drink

Bebas - you drink

Beba - he/she drinks / you drink (formal)

Bebamos - we drink

Bebáis - you drink (plural)

Beban - they drink / you drink (formal plural)
Test yourself on Present Subjunctive: Regular 'ER' Verbs
'Aprender' is a regular ER verb. How do you say 'I learn' in the present subjunctive in Spanish?