急,明儿要考试了、、1.I saw my mother ______ upstairs just now.为什么是填go

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急,明儿要考试了、、
1.I saw my mother ______ upstairs just now.
为什么是填go而不是went?
2.-Tom,I have`t seen your sister for a long time.
-She ______ Shanghai on business for three months.
为什么是填has been in而不是has gone to?二者有什么区别?
3.The movie has ______ for ten minutes.
为什么是填been on而不是started呢?

1. see sb. do sth.
2.in表示一个状态,go to 表示一个动作,后面说for three months,肯定是状态持续了3个月,而不能是go这个动作持续3个月吧
3.和第二题是一个道理

I saw my mother ___upstairs just now.A go B went C does D to I saw Li Lei (go) out just now.这里的空格填什么?为什么? I ----(see) Li Lei -----(go) out just now.答案是saw,go,为什么不是 sa I saw him go out just now. I saw Mr Green ______（walk) into the office just now,应该填什么? I saw my teacher go in to the classroom just now.改成被动语态怎么改? I saw my teacher go into the classroom just now.(改为被动语态) I am very upset I __(argue)with my mother just now 空填什么. 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 out just now.同义句转换 I saw him ___ just now.填leave还是left I saw him ____football just now.是填play还是playing