when i came into the room ,he pretend to be doing his homework 为什么是 be doing 而不是 to do形容词才要加be 为什么这里要加个beshe pretended to be innocent 为什么nnocent 前面也要加be 不定式to do什么情况下变成to b

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whenicameintotheroom,hepretendtobedoinghishomework为什么是bedoing而不是todo形容词才要加be为什么这里要加个beshepretendedto

when i came into the room ,he pretend to be doing his homework 为什么是 be doing 而不是 to do形容词才要加be 为什么这里要加个beshe pretended to be innocent 为什么nnocent 前面也要加be 不定式to do什么情况下变成to b
when i came into the room ,he pretend to be doing his homework 为什么是 be doing 而不是 to do
形容词才要加be 为什么这里要加个be
she pretended to be innocent 为什么nnocent 前面也要加be
不定式to do什么情况下变成to be?to be 后面一般都是什么
形容词才要加be 为什么这里的doing前面要加个be

when i came into the room ,he pretend to be doing his homework 为什么是 be doing 而不是 to do形容词才要加be 为什么这里要加个beshe pretended to be innocent 为什么nnocent 前面也要加be 不定式to do什么情况下变成to b
先解释上面那句话.
原句意思是,当我进房间的时候,他假装正在做他的家庭作业.
pretend to do sth 假装做某事 do 可以是实义动词,也可以是be 动词,在这里,要表示正在进行的意思,那么就要用be +动词ing 形式了.
不只是形容词才加be,be +动词ing 表示的就是正在进行的动作,be+动词的过去式,也可以表示被动语态,要用到be 的地方很多……
不定式to do当中的do 不只是实义动词,也可以是be 动词.

假装正在做某事，不定式的进行时态
不定式是 to+动词原形，be是am,is,are,was,were原型，所以是be

innocent 是形容词，无辜的，她假装她是（BE）无辜的
to be Doing,表示现在进行时，你进来的时候，他假装“正在”学作业。

pretend to be sth 或pretend to be doing sth 是固定句式

pretend to do sth 是固定句型，但是系动词are，is的动词原型是be，所以，pretend后面若加形容词就应该是pretended to be +形容词。而pretended to be doing表示假装正在做某事，强调动作正在进行，而pretend to do sth 表示假装做某事，有做某事的趋势，有表将来的意思。
when i came into the room...

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