If the weather (be) bad tomorrow we (play) chess At this time yesterday I (write) a test If I (see) Tom again I (tell) him everything If you (help) him he (finish) his work in time

If the weather (be) bad tomorrow we (play) chess
Это условное предложение про будущее (реальная ситуация).
В if-части ставим Present Simple, в главной части — will + V.
✅ If the weather is bad tomorrow, we will play chess.

At this time yesterday I (write) a test
Есть точный момент в прошлом “at this time yesterday”, значит нужно действие в процессе → Past Continuous.
✅ At this time yesterday I was writing a test.

If I (see) Tom again I (tell) him everything
Тоже реальное условие про будущее: в if-части Present Simple, в главной — will.
✅ If I see Tom again, I will tell him everything.

If you (help) him he (finish) his work in time
Реальное условие (вероятное действие): Present Simple + will.
✅ If you help him, he will finish his work in time.