省to的动词不定式变被动该怎么变?据说是要还原to,但是刚刚看到一个句子,he was last seen leaving his office at 7 p.m.yesterday,这一句为什么不用还原?he was last seen to leave和he was last seen leaving有什么区别

省to的动词不定式变被动该怎么变?据说是要还原to,但是刚刚看到一个句子,he was last seen leaving his office at 7 p.m.yesterday,这一句为什么不用还原?he was last seen to leave和he was last seen leaving有什么区别 情态动词,感官动词变被动语态如果感官动词后的是V-ing,变被动要不要加to?情态动词变被动语态例句,例题 后面跟to do的动词变被动语态是什么情况后跟不带to的不定式的动词变被动语态时要还原to,那么...还有跟doing的呢?例句 我问的是to 你们怎么理解的 动词什么时候变动词不定式 变被动语态,I heard Jane playing the piano in her room.(*^o^*)答案写的是Jane was heard playing the piano in her room.可老师讲的是：一些使役动词和感官动词用不定式作宾补,这时不定式要省略to,但变被动语态时 含有be动词的被动语态怎么变,have been done一定指被动吗 有没有动词变被动加to加在动词前面的...请举例. 省to的动词不定式,被动语态要加to的动词如题 英语主动变被动加to是不是只有 感官动词/使役动词＋somebody＋do 结构的句子 变被动加to.我这么说对吗?还有为什么他们变被动要加to 被动语态怎么变? 什么是动词不定式的被动语态?如to be counted: 带有to的不定式怎样变被动语态?平时省略to的不定式倒会变,可是加上to后应该怎样?比如:People oughtn't to criticze her for this matter. 如何确定定语从句中的宾语和主语? 感官动词的被动语态怎么变? prefer +动词+to+动词 两个动词怎么变? listen后面的动词是不是也需要变动词不定式或动词ing?到底是to do 还是doing还是to do 或doing 被动语态变主动语态怎么变 英语语法中,动词不定式to do表示被动和动词不定式的被动语态to be done表示被动有什么用法区别 英语语法中,动词不定式to do表示被动和动词不定式的被动语态to be done表示被动有什么用法区别