1.When I went into the office next morning I already (to formulate) my plan.2.Well, I don’t think I ever (to see) you before. 3. She ended by saying that she (to think) she (to make) a mistake. 4. She knew what (to go) on in their minds.5. So I went into the living room, where my aunt already (to wait) for me.6. She telephoned her husband to the office to say that her brother (to return) from abroad.7. An old friend rang up to ask how Elizabeth (to feel), and whether she (can) go with his wife to the concert on Sunday.