——关于过去分词1.Unlessinvited__ to speak,you should remain sil

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——关于过去分词
1.Unless__invited____ to speak,you should remain silent at the conference.
为什么用invited而不用.being invited?
2.Being tired,i did not go to work.
为什么用Being tired而不用tired?
3.I went home,tired.
为什么用tired而不用being tired.
请解释什么情况下用invited什么情况下用being invited以及tired,being tired.
并且说明他们各自是怎么变化而来的.

1.这是一个省略句,完整是Unless you are invited to speak,----用invited表示被动语态“被邀请”,主语加be动词可省略,而being invited 是进行时的被动语态,与题目要求时态不符.
2.being tired同样是一个省略句,I'm tired--变成省略句时,主语省略,但剩下的系动词与表语作为主语要用动名词形式.
3.tired作为形容词放在句末相当于副词,某些表示人身体状态的个别的形容词可以这么用.

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