how to do something When to do something Where to do sh.What to do...分别中文,举例,中文

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how to do something When to do something Where to do sh.What to do...
分别中文,举例,中文

how to do sth = 如何做某事,如 how to run the machine = 怎样开这个机器;
when to do sth = 什么时候做某事,如 when to hold the meeing = 什么时候召开会议;
where to do sth = 在哪里做某事,如 where to plant trees = 在哪里栽树;
what to do = 做什么,通常用作不及物,如 I don't know what to do = 我不知道该怎么办.