问题 用法疑问:We are exercised in boxing once a week.

《葛传椝英语惯用法词典》上有这样一句：不可说 We exercise in boxing once a week，该说 We are exercised in boxing once a week.但我查手头的词典都没有查到这类用法，请教各位专家。

问题 在肯定的陈述句或疑问句中，动词use 可以与 how long 连用吗？

...试题（一）》中，有这样一道选择填空题：28.- How long can the borrowers _____ the books from the library?  - For about fifteen days.   A.borrow   B.keep   C.lend  D.use     参考答案是 B。可以选择 D 吗？为什么？ 

问题 both的用法

...de methanol from coal and natural gas is both favorable feedstock for the process. 受句意影响，是不是应该改成Crude methanol(s) from coal and natural gas are both favorable feedstock for the process.虽然methanol应该是没法加s的，不可数。我知道这几句话...

问题 lead a happy life是否为同源宾语

老师好：请教一下。张道真语法书上在介绍主谓句型的时候，举例说明了某些词汇可以跟同源宾语。They are leading a happy and peaceful life now 中是否存在同源宾语？

问题 good exercise与a good exercise

Swimming is supposed to be _____ very good exercise for older people. 这里到底能不能加不定冠词a？有的人说能加不定冠词，有的人说不能加不定冠词。请教各位。谢谢！

话题 every once in a while

话题 be in for a shock

话题 a full-fledged home

话题 A King in New York

话题 a little bit late home

话题 a home away from home

话题 One student in a hundred

话题 while still a young man

话题 there came a turning point.

话题 have a good shot at