He tells her not to expect him certainly by the return coach, nor to be alarmed should he remain gone three or four days.should he remain gone three or four days 这是是倒装句式吗，为什么在这里用倒装?
... I was two years ago.老师这个是肯定回答，如果否定回答，并用than句型是不是这样说：Do you study English harder? Yes, I don't. I study less hard now than I was two years ago.老师可以这样说吗?谢谢！
...）复数的情况。例如：（09）Some suffixes were part of the words when they were
borrowed from other languages: doctor, eternity, courage.（IEG）(对于一些源于其他语言的词汇，他们的后缀本身就是词汇的一部分)（10）Make these sentences more emphatic by
'fronting...
为什么do you think 要用：疑问词 + do you think + 其它（正常语序）而do you know 要用：do you know＋疑问词＋从句,（从句采用正常语序）能写成：What do you think he wants?不能写成：What do you know he wants?
In the periods of peak zooplankton abundance, that is, in the late spring and in the summer, Haney recorded maximum daily community grazing rates, for nutrient-poor lakes and bog lakes, respectively, of 6.6 percent and 114 percent of daily phytoplankton production.开头这个abundance，它为什...
when falling at speeds up to 60 miles per hour, cats stretch their legs which increases their air resistance and reduces the shock of impact on hitting the ground.还有at speeds up to 中的up to 是：直到（达到）的意思吧
1. 表示“在周末”的意思时，在英国英语中可以用at the weekend 或者at weekends；在美国英语中可以用on the weekend 或者on weekends。注意：在单数形式 weekend 的前面有定冠词，在复数形式 weekends 的前面没有定冠词。例如：He works at weeke...