1. determine the tense.
she didn’t learn the rules yesterday.
we were singing the songs all the evening yesterday.
my mother had cooked the dinner before we returned.
yesterday they had been training for two hours before they left.
2. make negative and interrogative forms.
we watched the interesting film.
the teacher was explaining the rule.
we had been surfing the net all morning before we went training.
my brother had done his homework when we entered
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