We saw him______the building and go upstairs.

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We saw him______the building and go upstairs.
a.to enter b.enter c.entering d.entered
有一道题和这题差不多We saw them come into the room while having break.
不是说while 前后都是ing 为什么填原形
_____computer games too much is bad for your eyes.
a Plays b.To play c.Play d .Playing
He was often heard to sing(sing) by the river.
为什么要填to sing

1.B,首先,有短语see sb.do sth.see sb doing sth.,但do强调整个过程,doing强调动作,而且,你可以从后面的and go upstairs发现,前后的时态应该一致,所以选B
2.D,动词在句首做主语要用动名词ing形式
3.某些动词主动换被动需要还原不定时to,有短语make sb do sth,sb be made to do sth.
再问：第二题同义句转换的时候不是 to do 和doing 都可以作开头吗？
再答： To 表目的，你可以尝试将to 带入还原句子，句意就变成“去玩电脑太多是对眼睛不好的”明显句意不通顺，如果动词在句子中充当主语，你看到单句中有is ，那大概都是用ing形式
再问：是不是see是过去式后面用do 现在时就用doing？ We saw them （come ）into the room while having break. 这题为什么填原形要看while 还是 saw
再答： see 的短语有两个 see sb do ,see sb doing 但是前者比较强调于状态，后者强调动作，我给你个例句 1.Don't worry about it,i have seen him steal the bike so that you won't be arrested. 别担心，我已经看到他偷单车的整个过程，所以你不会被逮捕。 2.After i saw him stealing the bike,he ran to the corner immediately. 在我看到他偷单车后，他马上跑到角落里。就是说do,着重表现了过程，doing ，表现这个动作的发生。 We saw them come into the room while having break. 我们看到他们在休息的时候进入了课室。 We saw them coming into the room while having break. 我们看到他们在休息的时候进入课室。(having break 和 coming into the room两个动作同时发生)

We saw him ______the building and went upstairs 空里应填什么? 选择填空（英语）We saw him ____the building and went upstairs.A.to g 初二英语题1.We saw her ___ the house and go upstairs.A.enter B.to We saw him ________the building and went upstars A go into B we go up and down the apartment building in the 英语的一道选择题,高手进,求详解! We saw him_______the building and went ups we went quickly upstairs and into the hiding We use the _____ to go up and down the tall building.空内应填ele 初二英语7.We use a l____ to go up and come down in the building. Luckily we live Upstairs We saw our teacher go into office they (go) before we saw them.