'ER' Verbs : Strong Preterites
Spanish: Cambridge International GCSE, topic 10.7.5
Strong Preterites
All strong preterites are irregular in the imperfect subjunctive. Their imperfect stem is formed from their irregular 'ellos/ellas' form in the preterite and they take the AR/ER/IR endings. You just remove the 'ron' and add the imperfect endings.

'Poder'
- Pudiera/pudiese - I could.
- Pudieras/pudieses - you could.
- Pudiera/pudiese - he/she could / you could (formal).
- Pudiéramos/pudiésemos - we could.
- Pudierais/pudieseis - you could (plural).
- Pudieran/pudiesen - they could / you could (formal plural)

'Ser'
- Fuera/fuese - I was.
- Fueras/fueses - you were.
- Fuera/fuese - he/she was / you were (formal).
- Fuéramos/fuésemos - we were.
- Fuerais/fueseis - you were (plural).
- Fueran/fuesen - they were / you were (formal plural).

'Hacer'
- Hiciera/hiciese - I made/did.
- Hicieras/hicieses - you made/did.
- Hiciera/hiciese - he/she made/did / you made/did (formal).
- Hiciéramos/hiciésemos - we made/did.
- Hicierais/hicieseis - you made/did (plural).
- Hicieran/hiciesen - they made/did / you made/did (formal plural)

'Tener'
- Tuviera/tuviese - I had.
- Tuvieras/tuvieses - you had.
- Tuviera/tuviese - he/she had / you had (formal).
- Tuviéramos/tuviésemos - we had.
- Tuvierais/tuvieseis - you had (plural).
- Tuvieran/tuviesen - they had / you had (formal plural).
Test yourself on 'ER' Verbs : Strong Preterites
How do you say 'we had' in the imperfect subjunctive in Spanish?