2. Use the verbs in the appropriate form:
1) They (to finish) the course by this time next year.
2) Tom (to sell) his car two years ago.
3) You (to be) sick if you eat so much ice-cream.
4) She (to know) me for 10 years.
5) I can’t listen to him anymore. He (to talk) for an hour.
6) They (to play) when I (to see) them.
7) If he had written a letter to me, I (to answer) it.
8) She (to invite) to her friend’s birthday party last Sunday.
9) They were very tired because they (to work) since morning.