孩子培训班老师讲，must只能用在一般现在时，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...
Barack Obama resubmitted to Congress his long-standing plan to close Guantánamo Bay, calling the prison a “stain” on America, which drained military resources, stoked terrorism and did not make the country safer.请问：(1) Congress 和 his long-standing plan，哪个是宾语？(2) ...
1. Events are free, staffed by thousands of volunteers.非限制性定语从句省略 which is OR 过去分词作原因状语，逻辑主语为Events?2. My friends are in the bathroom, getting higher than the EmpireState.非限制定语从句省略 who are OR 现在分词作伴随状语，逻辑主...
...式？ 怎么理解表示“非事实”呢？3）Whether...or...引导的从句，也用虚拟式：Whether she be married or not, she is a good housekeeper.这句，句中哪里可以理解为“非事实”呢？4）用于一些公式化的固定结构：So be it then...Be that as it may...Suffic...
...on wool children 是什么意思吗？我觉得这里的 mean 应该加-s, 从句主语“cotton wool children”是作为一个概念，就像高考题中的被 underlined 的 part 一样。如果用 mean，则意思变了，会是“你知道 cotton wool children 要表达的意思吗”。请问...
I don't know where she comes from. 这句话是否正确？I know the place where she comes from. I know the place from which she comes. I know the place which she comes from. 这几个句子是不是都正确。
...for us all to share.请问这里in
our office是作状语还是tradition的定语？bring in是构成及物动词吗，for
us all是状语修饰bring还是cake定语（我感觉状语合适），to
share是修饰bring的目的状语吗？8.
What’s the point of helping him if he doesn’t make an e...
各位老师好，原文如下：John had a very good day and put his wallet containing £3000 into the microwave oven for safekeeping. Then he and Jane went horse-riding. When they got home, Jane cooked their dinner in the microwave oven a...
...'s Lives there was, in which I read abundantly, and I still think that time spent to great advantage.老师这句话中的Plutarch's Lives there was不应该用完全倒装吗？in which I read abundantly为什么用in which？ to great advantage是什么用法？
The general nature of his
history meant he could not analyze carefully what this obsecure officer may or
may not have contributed to that struggle between nations.
请问专家 what 引导的疑问从句中，为什么会用一般完成，而不用过去完成呢？