英语举例子！

You must study hard.
你必须努力学习。
You can't sit here.
你不能坐在这。
Tom may be doing his homework now.
汤姆现在也许正在做作业。
She might be watching TV this time last night.
她昨晚这个时候也许正在看电视。
You could come here earlier.
你应该再早一点来。
The work coule have been done.
这项工作应该已经被完成了。

I must go home
I can't move
He may be sleeping
He might be laughing
We could have win the game
Things could have been better

I must study hard.
I can't do that for you.
I am having lunch now.
He may be swimming in the pool.
She might be doing her homework.
My computer went wrong yesterday.
He could have saved the money for himself.
The homework could have been done earlier.