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...
Having been delayed by heavy traffic,_______.A.it is impossible for her to arrive on time B.it led to her being late C.she arrived late D.her friend thought that she would be late
...在这道题中：But for his help, we____(work) now. 答案给的是would be working，感觉否定是不是也对，即wouldn't be working, 我的答案填的是wouldn't work可以吗？这里now不是此时此刻，而是当下这一段时间的概念，或者说出现now的句子一定要用进...
...(iv) 按照所提到的方式生活和为人。例如：live up to one’s beliefs 实行某人的信念live up to one’s professions 做的和本人的自白一致live up to one’s standards one expects of others 达到某人期望于他人的标准（二）摘自中国大百科全书出版社201...
曹老师提到（http://ask.yygrammar.com/q-26040.html），Use too many with countables to talk about more things than necessary or possible.中的than从句=than are necessary or possible（than为主语，对应但不等同于主句的things)He never says more than is necessary.无省略，than...
...r the starlight, and saw spread before me the darkened earth surrounding with her arms countless homes furnished with cradles and beds….困惑：判断saw后的宾语成分①如果只有spread作宾语，即spread为n. 表示“蔓延”，before me为后置定语，the darkened earth surroundi...
After all,nothing is more important than being healthy .请问老师，这个比较状语有问题吗？如何改，一般比较状语从句与主句相同的成分都要省略吗？在这里than是介词，还是连词，如果是介词，being healthy是宾语了，介词短语都可以作比较...
你好老师 It will be the beginning of the long process of integration that will ultimately lead to a fully electronic human before the end of the next century. 句中that代指的先行词是integration吗？ 是否it be...that 句型中，先行词是前边的表语成分？ ...
...pporting a dazzling variety of life, we have to remember that vast forests like these, often thousands of miles away, are crucial to every one of us, not least because they help to stabilise the climate and maintain the water cycle.请问：often thousands of miles away 这个插入语是定语从...
...as exciting
to see the glass ball falling slowly through the darkness.②I like to sit by
the window and watch people go by.①句为什么就强调了“现在”呢，为何用ing呢？②句我认为是指“看着人们正来来往往”，为什么又用do了呢？我好像不太理解什么叫...