您好，老师。最近本人的一个朋友给他的学生讲课的时候，说：This is the only key to unlock the door. 是有语病的，会让人理解成："The key can unlock the door." 而key怎么能做unlock的主语呢？因此是病句。我觉得这句话可以接受，但...
...by 2016, before a modern fiscal system will be built by 2020.
2. 下面的句子是正确的，为什么不用逗号？
She had to give the doorman a tip before (= in order that) he would help her with her suitcases.
她得给看门人小费，好让他帮她提箱子。
Scientists generally hold that language has been so long in use that the length of time writing is known to cover is trifling in comparison问：本句如何翻译，that the length of time writing is known to cover如何理解？
Although resolving to clean up stuff is a typical New Year's resolution, there is rarely something as motivating to kick-start the process as a reality makeover show.这里as…as中的部分是somthing的后置定语语吗？比较的是something与show的后置定语？
...看作谓语。 as separate from concrete realities. as 看作介词，引导的这部分，看作被省略的主语的补足语。separate 可以理解为前面省略了being，和separate from concrete realities 一起作as的宾语。后来进一步明确找到了答案。 它是一个固定...
老师好！请教一道have to的问题：新概念一P255有段：Do you have to get up early tomorrow morning? Yes,
I'll have to get up at six o'clock. 我想问下问句是用一般现在时代替一般将来时吗?可以改成Will you have to
get up early tomorrow morning? 吗？
1）新概念2第79课：I
used to travel by air a great deal when I was a boy. My parents used to live in
South America and I used to fly there from Europe in the holidays. A flight
attendant would take charge of me and I never had an unpleasant experience. I
am used to traveling by air and only on...
...ken in into the garden. He often does this!' 请问老师，这里的My dog had taken in into the garden. He often does this!在引号内，不受said的影响，那么这里的had taken用过去完成时所参考的过去时间点是什么?是找到钱包那一刻么？