be to do something和be doing something有何区别

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betodosomething和bedoingsomething有何区别betodosomething和bedoingsomething有何区别betodosomething和bedoingsomet

be to do something和be doing something有何区别
be to do something和be doing something有何区别

be to do something和be doing something有何区别
第一个是要去做某事 第二个是正在做某事

be to do something指计划做某事,如:We are to meet her at the school gate.
be doing something指正在做某事,属于现在进行时。如:
He is doing eye exercises now.
They are helping the engineers design the main project now.