1. watch for 与 wait for 均可表示等待，它们的区别是什么？2. watch sb do sth 中的不定式不能带 to，watch for sb to do sth 中的不定式是否带 to？3. watch sb doing sth 中 doing 是现在分词，watch for sb doing sth 中的 doing 是现在分词还是动名词？如...
He was a very polite and intellingent man,and he took me on a tour of the country.老师，Take sb on a tour of sth.把这个当作是固定搭配(像套公式这样套用吗，这种结构方式在阅读经常出现，是知道它如何用就行了吗？)，还是用句子成分分析它：take(谓...
句子：Like in terms of blood pressure and lots of other measures, the calorie restricted monkeys are much healthier and they just look and act younger than the monkeys in the normal diet group.问一：请问句首的like是连词引导方式状语吗？还是介词啊？问二：两个绿色部...
A sedentary lifestyle and a changing diet has doubled the number of obses Australians and trembled the army of fat children in the past decade.用and连接的并列主语后面为什么用单数动词（A and B后面用单数动词）？
One might see all this as simply an example of the economics of information and greed. And indeed it is, if by greed one means the effort to earn a profit by providing what people are willing to pay for, even if what they want is information rather than a tangible product.条件状语从句怎么...
下面是一道中考题：He had a ( ) visit to Canada last month.A. ten daysB. ten-dayC. ten-daysD. ten day答案是B, 但是我认为上述除了C错误，其他3个答案都是正确的。因为我在语法书上查询到a ten-day absence, a ten day absence, a ten days absence, a ten days&...
Grammar is a kind of sentence-making machine. It follows that the teaching of grammar offers the learner the means for potentially limitless linguistic creativity.1） a kind of 后应该用machinese复数吗？2） the teaching of grammar是什么结构？ 上句中，可以换用 teaching grammar ...
"and one teeny faded blue piece, about the size of a penny matchbox, that was from grandpa's uniform that he wore in the civil war" 这个句子逗号后面的that引导的是限制性定语从句吗？
新编英语语法教程中,说有的介词意义上等于that 从句:Did anyone inform you of the change of the plans?=Did anyone inform you that the plans had been changed?是做状语吗? 因为that是宾语,构成双宾, of the change of the plans是状语吗? 什么状语呢?
A string of accidents, including the partial collapse of a cooling tower in 2007 and the discovery of an underground pipe system leakage, raised serious questions about both Vermont Yankee's safety and Entergy's management especially after the company made misleading statements about the pip...
1,He was very tired by he finished.2,He was a government official before 1949.请教曹老师，在您的这个回答中http://ask.yygrammar.com/q-32435.html写道，by介词短语作时间状语，by后时间名词表示的时间点是说话人关心的时间，before介词短语作时间状语，...
He has been away for one minute.他已经离开一分钟了。
He has had this book for two months.他买这本书已有两个月了。在这两个例子中，应是把left和lent换成了一种状态。
但是对于其他的表达，如我已经修好这个车子三小时了，可不可以用 hav...