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4)
a. We have studied...
b. William hasn't tried...
c. They haven't known Peter...
d. Paul has ran...
e. I have stopped...
f. You haven't passed...
g. We haven't lived...
h. Tom hasn't written...
i. We haven't played...
j. Stuart has worn...
k. She has won...
l. He hasn't worked...
5)
1. will buy.
2. won't join.
3. won't go.
4. might go.
5. will definitely win
6)
1. never
2. just
3. since
4. ever
7)
1. How long have you known Jerry?
2. Where did you meet him?
3. Have you and Jerry ever worked for the same company?
4. Has Jerry lived in England?
5. When did he live in England?
8)
a) has lived
b) was
с) has spent
d) worked
e) hasn't had
f) hasn't tried
g) studied
h) moved
i) has been