...在一般现在时，其它时态应该用have to代替。如过去时用had to，一般将来时用will have to。但今天做练习册时，我却发现一道题：
用情态动词填空：
--Must I return the book tomorrow?
--No, You _______.
句中 Must I return the book tomorrow? 是一...
In the late 1990s, the first web browsers made networks, which had been for science labs and the military, accessible to any of us, giving birth to the modern internet.其中which引导的非限制性定语从句怎么理解呢？
...sp;thousands of years. Most ancient cultures had weather gods, and weather catastrophes, such as floods, played an important role in many creation myths老师，这句话是weather catastrop...
I think the bird flies but the sea birds fly, is that no courage of the sea, years later I discovered, not the bird flies past, but not the other side of the sea, and had no wait...
...hing me, I was not afraid in the ordinary sense, as I would have been
if I had been alone 2.The bad news was that he
could be a very dangerous person he choose to be向刘老师请教，句子1中 would have been 后为何可以省略 afraid，句子2中choose to be 后为何可以省略 a very dang...
The evening conversation, when they were all assembled, had lost much
of its animation, and almost all its sense, by the absence of Jane and
Elizabeth.他们一家子晚上聚在一起聊天的时候，Jane和Elizabeth不在场，谈话就没有了活力，而且几乎是完全失去了意义。请...
The hole in the stratospheric ozone layer over Antarctica did not grow as fast this year as it did on average between 1991 and 2006.为什么从句不用过去完成式had done呢，表示过去的过去啊
In those days the poor people had a hard time.老师，关于这句话的句子成分的分析我理解如下，不知道我这样理解是否正确，如果不正确，麻烦您指正，谢谢。in those days 在这里是做时间状语；those 是做定语，修饰days；the poor 是做定语，...