1.Our headteacher took part in the swimming match by himself.(改为同义句）
Our headteacher took part in the swimming match (all) (alone).
2.I'd like to (see the latest film) tomorrow evening （对划线部分提问）
（What） （would） you (like) to (do) tomorrow evening?
3.She seems to be quite happy .(改为同义句）
(It) (seems) (that) she is quite happy.
4.Can you tell me how I can get to the shop?(改为同义句）
Can you tell me how (to) (get) to the shop.
5.Jim had (some bread and a glass of milk) for breakfast （对划线部分提问）
（What） （did）Jim (have) (for) breakfast?
6.People can use email to send messages.(改为同义句)
People can send messages (by) (email).
7.Jack lent me a book last Monday (改为同义句）
I (borrowed) a book (from) Jack last Monday.
8.If you want to record,(press the red button).(对划线部分提问）
(What) do I (do) if I want to record?
9.My watch didn't work (改为同义句）
My watch (stopped) (working).
10.Get up early ,and you'll catch the early bus.(改为同义句）
(If) (you) (don't) get up early ,you'll miss the early us
11.He spends much time playing computer games.(改为同义句）
It (takes) him much time (to) (play) the computer games.
12."Don't play in the street!" he warned me.(合并为一句）
He warned me (not) (to) (play) in the street.
13.He won't be busy .He will take a walk (用if连成一句）
(If) he (isn't) busy ,he (will) (take) a walk.