请说明为什么?I saw him ----the room,but I didn't know when he-----.A going into；left there B go into；left there C going into； left to there D go into；left for there

I saw him go out.为什么不能写I saw him went out It's 3 years since I saw him last time. 中的is能否换成has been? 请说明原因好吗. 请说明为什么?I saw him ----the room,but I didn't know when he-----.A going into；left there B go into；left there C going into； left to there D go into；left for there I saw him reading/read just now为什么? I saw him dancedance为什么不加d? 是I saw his father beat him 还是I saw his father beating him.选哪个,为什么 初中英语42.--i looked for your father ___but i still didn't find him.--i saw him watering flowers i.a anywhere b nowhere c everywhere d somewhere 请翻译句子和选项并加以说明原因 I saw a movie called Hero last night.(同义句) I saw a movie_____ _____ _____ Hero last night.请说明原因.填with the name行不行?为什么? this is the man_____last nightAwhom I saw him Bwho I saw Cwhich I saw Dwho I saw him I saw him （从…出来）the office.请说出理由. I saw him go into the classroom just now .为什么SAW后的动词不是ING形式呢? it is years since i saw him（追加）it is years since i saw him为什么不说it is years since i has seen him而it was years since i had seen him 却可以 i saw him ____(walk)into the I saw him go out just now. I saw him ____ into that room. I saw him in the street是什么意思 I saw him go 什么 the classroom I saw him dancing.改为被动语态