Complete the sentence: They ... English last year. were taught was taught were teach teach will teach

They were taught English last year.

Предложение употреблено в простом прошедшем времени (Past Simple Tense) в пассивном залоге (Passive voice) по следующей схеме:

Действующее лицо + was/were + глагол в 3 форме.

Если смысловой глагол правильный, то добавляем окончание - ed.

I/he/she/it was;

You/we/they were.