Ex3: 1) has lost; lost; 2) have you ever driven; 3) has never had; 4) did you see; has just phoned; 5) yet; 6) eight weeks ago; 7) I've been; for; 8) it's already started;
Ex4: 1) we've known; for; 2) I've been working 3) has passed; did he get...? 4) has gone; Did she leave...? 5) has stood
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Ex3:1) has lost; lost;
2) have you ever driven;
3) has never had;
4) did you see; has just phoned;
5) yet;
6) eight weeks ago;
7) I've been; for;
8) it's already started;
Ex4:
1) we've known; for;
2) I've been working
3) has passed; did he get...?
4) has gone; Did she leave...?
5) has stood