原句：I have lived in cities all my life and when I am at home I usually take
the subway or bus.1. 为什么该句前面用现在完成时have lived？2. 为什么是用city复数？而不是用单数city呢？3. 为什么是take the subway or bus用定冠词the的，而不是用不定冠词a呢...
...http://ask.yygrammar.com/q-21171.html )：变间接引语词序：Who is your English teacher?同时我想到另外一个问题：如果直接引语是What’s the matter? 呢？书上说只能用：He asked what was the matter.而不能用：He asked what the matter was.但我在一篇阅读...
...两处疑惑：1.句子：From a review of the literature of the field it is clear that all the approaches adopted to study the phenomena of SLA so far have one thing in common: The perspective adopted to view the acquiring of an additional language is that of an individual attempting to do so.疑...
It is increasingly obvious that the planet’s ecology is breaking and there is a need for an intense and global effort to halt and reverse these dreadful trends.”that…breaking是引导主语从句吗？there is a need for ab to…的for an to…都是后置定语吗？
After the interruption, the speaker went on talking as if nothing had happened.When I told them my plan, they looked at me as if I was mad.请教老师这两句话是虚拟吗？是不是如果主句是过去时，as if 是否是虚拟看不出来？谢谢！
This responsibility does not entail my doing for you what you are capable of doing for yourself; nor does it mean that I run your life for you.what 这里是后移，引导的一个宾语从句吗？