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4. Peter can t open the door. He thinks he (to lose) the keys.
5. Susan (to tell) me that she (to be) at the park last Wednesday.
6. Tom (to go) to Germany next year.
7. He (not to listen) to the teacher last lesson.
8. You (to go) to the swimming pool every day?
9. I already (to write) a letter to my friend.​