看到两个句子。1.It can be dated back to 9th century China.2.It can be dated back to the 9th century in China.第一个是做定语，所以century前面不加the。第二个情况是固定搭配，在century前面加the。是这样理解吗？另外也有人说这里date back to要用主动...
...，粮食总产量增长了3倍多，年均递增3.1％。
The total grain output in 1995 more than quadrupled the 1949 figure, or an average increase of 3.1% a year.
别人跟我讲more than在这里作副词，quadruple在这里作谓语动词，这我明白了，但是我不明白
",or a...
He don't know what time he have been out of work.理解：He don't know he have been out of work in that time？He don't know when he have been out of work.when百分百等于what time吗？还是是时间状语吗，修饰谓语动词？
...rworms were reported throughout the night by participants, with those catching an earworm taking longer to fall asleep, spending more time in the light stages of sleep, and waking up more times during the night.请问粗体部分是伴随状语吗？划线部分是并列分句吗？
...f Antarctica's treaties before their expiration.2.But strength of will is the missing ingredient where Mr.Cameron and Public Health are concerned.定冠词的省略问题，例如句子中的特指为何省略了the，在何种语境可以省略呢？
Knowing that this case is exceptional, I would like to give you some kind of compensation.1.本句如何翻译？2. some kind of 与some kinds of有什么区别？3.of后面跟的名词用单复数如何选择？