to be doing ,to doing 与 to done 之间的区别?弄的稀里糊涂的,

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to be doing ,to doing 与 to done 之间的区别?弄的稀里糊涂的,
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to be doing ,to doing 与 to done 之间的区别?弄的稀里糊涂的,
to be doing ,to doing 与 to done 之间的区别?
弄的稀里糊涂的,

to be doing ,to doing 与 to done 之间的区别?弄的稀里糊涂的,
to be doing 是将要的意思,I am to be doing a presentation.
to doing 中的to 只能是介词.
to done 是 to do 的过去式.

to do 动词不定式
to doing 这里的to作介词用,所以用doing的形式