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问题 to do还是to have done

... after doctors completed a 20-hour operation _______ one-year-old twins at the head.A. to separate B. to have separated  老师，您好。此题究竟选A还是选B，我一直困惑不解。有人说只可以选A，有人说必须是B。您的看法是什么呢？为什么？ 

问题 no more ...than的用法

They did no more to make themselves feel at home than the early American settlers who christened Little Rock and Salt Lack City. 书上翻译是他们的做法就如同早期到美国的殖民者为小岩城和盐湖城命名那样，让这两个地方听起来更为熟悉。 这就话为什...

问题 句子理解问题（is what it always is with women.)

She has her faults, and the greatest of them is what it always is with women.老师好，请问and后面的句子想要表达什么？

问题 have sth done还是have done sth

Mrs.Brown was much disappointed to see the washing machine she had ______ went wrong again.答案是repaired，为什么不能用it repaired呢?我的想法是这台洗衣机不是Mrs.Brown自己修的，而是她请人修的，所以填了had it repaired。

问题 当并列主语既包括过去又包括现在时谓语动词用什么时态

Both the ancient and modern Olympics____ held every four years.谓语动词用are吗？当主语既有发生在过去的事又有发生在现在的事时，谓语动词用什么时态呢？

问题 可以what+名词引导名词性从句吗

The scientists have absolute freedom as to what research they think is best to pursue.请问老师，这里的what是不是做名词性从句中pursue的宾语，还是把what research看作一个整体当名词性从句中is的主语（但是这样分析怪怪的，可以what+名词引导名词性...

问题 be good for doing 与 be good to do

This is because the juice from tomatoes is really good for making surfaces clean.请问句中的 for making 可以换成 to make 吗？

问题 set an example to/for（介词区别）

They're also setting a great example for others about how to make the best o a bad situaiton.句子摘自北师大高中英语必修第三册第8单元(p43)。请问句中的介词 for 能换成 to 吗？若可以，set an example for 与 set an example to 有区别吗？

问题 为什么不能说：A horse is a useful animal.

为什么可以说：正：The horse is a useful animal.正：Horses are useful animals.却不能说：误：A horse is a useful animal. 

问题 介词since可以后接副词作宾语吗？

Since用作介词时，通常是后接名词、代词、动名词作宾语。如： I’ve worn glasses since my childhood. 我从小就戴眼镜。 We’ve come fifty miles since lunch. 我们午饭后走了五十英里了。 She’s been working in a bank since leaving school....

问题 mother and son可以不用冠词或物主代词吗

Mother and son lost contact when Nicholas was in his early twenties. 尼古拉斯20岁出头的时候母子就失去了联系。这里的mother and son（母子）前面没有用冠词，好像原来见过，father and son（父子）也不用冠词的，这是一种习惯吗？如果是 mother and ...

问题 有for five years为什么用过去时呢

—Does your sister work as a teacher in Canada? —No, but she once ______ there for five years． A．taught B．had taught C．has taught D．would teach改题答案为A,可不可以用完成时啊，谢谢！

问题 120 kilometers away from Xi'an是作状语还是什么

Mount Hua is located in Huayin City, 120 kilometers away from Xi'an.请问各位老师，这个句子中的120 kilometers away from Xi'an是作状语还是什么？

问题 agree with sb that...结构分析

...样同时发挥出它们的两种用法呢？ 比如 this girl believes in this religion that ...... 或者 he complained to me that...

问题 "Thanks"视为名词还是引导感叹句？

句子如下：Thanks for your attention and belief in us and we are glad to provide as many details as we know.有人说Thanks是一个感叹词，也有人说这里的Thanks是一个名词应该改为动词形式"Thank you for your..."请问这里的Thanks该理解为什么成...