上面be careful 的补语，肯定句为什么用in
doing sth?否定句为什么用动词不定式(not ) to do sth?肯定句可以用be
careful to do sth的形式吗?为什么有的补语用（in）doing sth 的形式，有的用to
do sth的形式?是固定用法还是有一定的规律? 又如：h...
朗文词典说 be/lie at the root of sth (=be the cause of something)是某事物的根本原因,例句：1)Allergies are at the root of a lot of health problems. 过敏是许多健康问题的根源。2)The love of money is the root of all evil . 贪财是万恶之源。为什么句1）are at the ...
前几天有网友问及下面句子中的would have done是虚拟语气还是情态动词推测性用法：He will give his workers three days off, but only a decade earier, such an act would have required legislative approval in Virginia.They are recycling things they would have thrown away in the...
老师您好！1）The
surface feature has remained in popular culture since the image of the
"Face on Mars" was known.可否说成...since
the image of the "Face on Mars" "has been" known 用现在完成时呢？2）语法书上说She
has never written to me since I was at this school. 自从我“...
A recent study found that the number of Americans with high-speed Internet at home today actually fell during the last two years
请问today是时间副词作状语吗，如果是那么fell用过去式是不是错了？？
老师好， 我大体了解before（two years before过去时间点之前）和ago（two years ago现在之前）的区别，也知道用before的话，时态应用过去完成时。但是今天遇到了两个句子： 1. If you want to get up early, sleeping earlier the n...
老师，您好！(1) 不合逻辑的否定句：I wonder if we can not get any more.是否可以去掉not而含义不变？ 即I wonder if we can not get any more = I wonder if we can get any more(2) 否定疑问句：What nonsense would he not talk ! not可否放到前面变为 What nonsense ...
•Mr Lewis, living
with us since he returned, is now a well-known author. （葛传椝英语惯用法词典）•He is author of
the capital review of Anacreon in E. R. He is to be heard of at No. 30 Craven
Street , having lived with us since he came to town . （google图书）[问] 请问老师...
When he ___1___ home, he told his friends about the cold place. A.returned to B.returned back C.returned 问题一：哪个选项可入选，return与return back有什么区别？问题二：when所在的主从复合句中，主句和从句可以同时使用一般过去时吗...
...状语，只不过就是这个现在分词起到补充说明作用？2)I am on to breakfast, meaning now I am going to have my breakfast.meaning短语的逻辑主语是主句，那它修饰的也是主句吗，这样说是否逻辑有冲突呢？还是说它修饰的是系表结构？另外，有没...
...最近看到一个句子：My home in Boston is far enough north to be just barely outside the supersonic wind zone.问题一：be 的用法问题我去查了下字典关于be的用法：1. 它可以作为系动词使用，但前面已经有一个 is 作...