doing是现在进行时,如：is doing sth.；它还可以做第二动词,如：love/enjoy/pretice/ doing
to do也可以做第二动词,如：tell sb. to do sth./want to do sth等
done是do的过去分词,用法如：They have alreay done a lot of things.
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done to do与doing的用法
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