Rewrite the following sentences without changing in meanings:


1. Don't stop him from doing what he wants. 
->  Let him................ 
2. Tom has arranged to have dinner with Ann on Friday. 
-> Tom is........... 
3. We started learning English when we were in grade six. 
-> We've...........
4.Someone has taken some of my books away. 
-> Some of my books............
5. Tom  doesn't  smoke cigarettes any more. 
-> Tom used.........