1)There isn’t a cloud in the sky, but it (to be) cloudy in the morning. 2)Mrs. Clay usually finishes her work at half past three, but she (to finish) it later yesterday afternoon. 3)Every day I help Mom about the house, but last week I (to be) very busy with my exam. So I (not to help) her much. 4)Tom isn’t playing tennis tomorrow afternoon, he (not to play) tennis yesterday. 5)We generally have lunch at 12.30, but yesterday we (to have) lunch later.