I saw him go 什么 the classroom

I saw him go 什么 the classroom I saw him go out just now. I saw him go out of the room.(第二个动词go为什么不用过去式..谢) I saw him go into the classroom just now .为什么SAW后的动词不是ING形式呢? i saw him go into the room（变为被动态） i saw him ____ the supermarket just nowA,go b,come c,enter d,arrive i saw him (go) out of the room.三单后不是跟goes吗? I saw him go out.为什么不能写I saw him went out i saw him ____(walk)into the I saw him in the street是什么意思 this is the man_____last nightAwhom I saw him Bwho I saw Cwhich I saw Dwho I saw him He can't be in the classroom,I saw him go home a minute ago 我想问一下问什么不能用mustn't而用can't? I saw him into the bedroom one hour ago a.go b.going c.to go d.went I saw him to go out to play改错 I saw him while he was crossing the street 与 He was crossing the street when i saw him 有什么区别 -Is Jack in the library?-Maybe.I saw him ______-Is Jack in the library?-Maybe.I saw him ______ out with some books just now.A.going.B.go.C.to go.D.went. I saw him yesterday afternoon=I saw him in the afternoon yesterday吗 -IS jack in the library?-Mabaybe.I saw him _____ out with same book just now.A:gongB:go