用括号内所给动词的适当形式填空。
We ________(watch) the boys ________(play) basketball on the playground when something strange happened.
I don’t know what _________ (happen)to him just now.
Computers are useful to us. But some students only use them ________ (play) games.
–--Would you mind ________(take) photos with me? 
--- Of course not. When I miss you, I can have a look.
You may go to play football as soon as your homework ________(finish).
Middle school students ________(tell) not to smoke.