seem to be doing sth ,seem to do ,seem to have done sth这三者有什么区别,

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seem to be doing sth ,seem to do ,seem to have done sth这三者有什么区别,
seem to be doing sth ,seem to do ,seem to have done sth
这三者有什么区别,

seem to be doing sth ,seem to do ,seem to have done sth这三者有什么区别,
seem to be doing sth表示不定式的动作和主句中seem是同一个时态,比如,He seems to be doing his homework.他好像正在做作业；
seem to do 表示不定式的动作发生在主句动词seem之后,比如It seems to rain.好像要下雨了.rain的动作,是发生在seem之后的；
seem to have done sth表示不定式的动作发生在主句动词seem之前,比如 she seems to have finished her homework.她好像做完了她的家庭作业.finish的动作发生在seem之前

seem to be doing sth 似乎正在作某事
seem to have done sth 似乎已经做过某事
seem to do sth 似乎将要作某事

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seem to be doing sth表示不定式的动作和主句中seem是同一个时态，比如，He seems to be doing his homework. 他好像正在做作业；
seem to do 表示不定式的动作发生在主句动词seem之后，比如It seems to rain. 好像要下雨了。 rain的动作，是发生在seem之后的；
seem to have done sth表示不定式的动作发生在主句动词seem之前，比如 she seems to have finished her homework. 她好像做完了她的家庭作业。finish的动作发生在seem之前
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seem to be doing sth 看上去（好像）正在做。。。
seem to do 看上去在做
seem to have done sth 看上去已经做了。。

seem to be doing sth ,seem to do ,seem to have done sth这三者有什么区别, seem doing sth 还是 seem to do sth?RT seem to be 和seem to doing分别什么含义 what is the difference between 'seem to do sth' and' seem doing sth'? be used to doing sth =used to doing sth be addicted to sth./doing sth和addict oneself to sth./doing sth有什么区别 be worth to do sth 还是be worth doing sth be scared to do sth还是be scared doing sth be glad to do sth 还是be glad doing sth be heard to do sth 还是 be heard doing sth? be used to+doing sth是什么意义用seem造句,比如seem to do sth,to be 加形容词,名词和介词还有seem that. be accustomed to后面加do sth.还是doing sth? Attentions must be paid to do sth还是doing sth be worthwhile of doing sth.还是to do sth. be used to do sth,be use to doing sth,be use to sth,be use for sth区别请问want doing sth =want to be doing吗 seem to do 还是 seem doing?