1.It__as if they could see and hear us in action?为什么选will be

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1.It__as if they could see and hear us in action?为什么选will be不选was
2.Until recently historians assumed that calendars__with the advent of agriculture为什么选come to existence是因为existence是名词吗?
3.a student had dressed up as a policeman and was amusing himself__
为什么选at other people's expense不选by making fun of people
4.不知道有谁记得,新概念3里面有个地方用as if后面加动词原形,请问这是怎么回事?有这种用法吗?
5.请问如果物主代词比如his在介词后面要不要写成him，（这样不是不能代表“他的”的意思啊?）还是原来的his？

1.这个大概考察as if 引导表语从句吧.
表语从句位于连系动词后,有时用as if引导.其基本结构为：主语 + 系动词 + that从句.

2.come to 中的 to 是介词,后面需要宾语.existence是名词,可做它的宾语.
3.最后那半句大概是说"牺牲别人来取悦自己".

4.不记得.
5.依情况而定,不一定要改写成him.
这个问题你可以从字典上找些例句看看,也许有帮助.

1.It__as if they could see and hear us in action?为什么选will be they will be able see and hear us in action 怎么理解 in action they will be able ,as it were,to see and hear us in action. 英语高手进.They will be able,as it were,to see and hear us in act some files were in use and could not be deleted.They will be what would your life be like if you could not see or hear?这句 8.We moved to the front row so that we could hear and see be 1.Bady pandas will be in danger if they ____(leave)alone in 1.I have no doubt in my mind _____ they will be glad to see She could neither see nor hear.为什么要加个could? If love can see us through then will be together somewhere n If he _________(come) to see us,will be very happy.