i (say) i (write) the exercise last monday.
tom was late. we (discuss) everything when he (come) .
when i saw a bike i (understand) why boris (buy) it.
it (be) a game that i (not/play) before.
the students (know) that we (buy) a radio.
the house (be) dirty because we (not/clean) it for weeks.
i (come) late to school because i (miss) the train.
susan (be) hungry because she (not/have) dinner.
i (remember) he (meet) them last week.