i saw him enter the teachers,office just now改被动

i saw him ____ the supermarket just nowA,go b,come c,enter d,arrive I saw him enter the room just now.(改被动） i saw him enter the teachers,office just now改被动 改句子：I saw him enter the reading room a few minutes agoI saw him enter the reading room a few minutes agoHe was _____ _____ _____ the reading room a few minutes ago i saw him ____(walk)into the I saw him in the street是什么意思 I saw him go 什么 the classroom this is the man_____last nightAwhom I saw him Bwho I saw Cwhich I saw Dwho I saw him A small boy saw him enter the house被动语态是什么 Yesterday I saw him ___ the classroom alone.A go B enter C to enter D to go into这里的选项里的To都是动词不定式做宾补吗? I saw the boy enter the room变成被动语态the boy（ ) ( )( ) ( )the room I saw him yesterday afternoon=I saw him in the afternoon yesterday吗 I saw the boy___the classroom.A.enter into B.enter C.to enter into D.to enter这题应该怎么选?enter和enter into到底有什么区别? i saw him walk into the next room被动语态 I saw him singing in the room.改为被动句 I saw him come into the classroom.（同义句） I saw him ———— the classroom. 有英语题让我困惑很久了,Excuse me ,did you see our teacher just now?I saw him --the room.答案是enter 还是 entering还有一题；I saw him --basketball just now.答案是play 还是 playing.我认为两个答案都是动词原形.因 I advised him not to enter the cave I suggested his not going into the cave.I advised him not to enter the cave.和I suggested his not going into the cave.为什么一个用his,一个用him