Your knowledge can be no stronger than the knowledge you have of ideas in a subject.其中knowledge you have 和（knowledge）of ideas是否作knowledge的两个修饰理解。为什么不能说your knowledge of ideas，是否更顺
...ht to词条有一例句：You were out enjoying yourself when you ought to have been studying.应该学习的时候你却在外玩。这里have been studying是否应改为be studying?因为主句为过去时，所以ought to也表过去，其后再接个完成进行时，则语意不通；如果oug...
...个句子有些疑问，请帮答疑解惑。1）：it costs between $1000 and $1200.2）：He is believed to be worth somewhere between seven million and ten million dollars.据说他身价约在700万到1000万美元之间上述cost, worth应该分别为及物动词或介词，后面跟的短语...
I am to buy a house. 是不是等于 I am going to buy a house.I am to write a note. 是不是等于 I am going to write a note.请问，老师，am to 是什么结构，还有与它相似的结构吗？有 are to，is to, was to..等？
...h ways before crossing the street.2.
customary practice or use:◎
Daily bathing is an American habit.3.
a particular practice, custom, or usage:◎ the
habit of shaking hands.4.
a dominant or regular disposition or tendency; prevailing character or quality:◎ She
has a habit of looking at the brig...
... east China Sea Air Defence Identification zone includes the skies over islands whose sovereignty is disputed by China and Japan，it was declared by China over the weekend and (was) immediately condemned as destabilising by the US Defence Secretary Chuck Hagel.括号中的was是否可以省略，...
... in the living tissues, till at last it took possession of his whole being and forced him irresistibly to action.1）为什么会出现whether there was not...？ 这里的not是否多余？我们通常说whether...(or not 可省略)，没见过whether...not这种句型。2）最后的force sb to ac...