I know whereof I speak. I know whereof I talk about. 老师好！这里的whereof=of which/what,那第一句话为什么不在speak后面加about？whereof中的of跟在主句动词后还是从句动词后？whereof的词性是连词还是副词？像这种where/there/here+介词构成的合成词...
birds of prey (= birds that kill for food) 猛禽osprey: a large bird of prey (= a bird that kills other creatures for food) that eats fish 鹗；鱼鹰prey：an animal, a bird, etc. that is hunted, killed and eaten by another 猎物那为什么birds of prey (= birds that kill for food)为什么是...
So long as Ben is shown exactly how to do something, he is less likely to figure out himself how to accomplish such a task.如果我们向Ben演示该如何做某件事，那他就不大可能自行想方设法完成这件事。 请问专家老师们，as long as或so long as的意思通常是...
...ing, people came up with an idea to build an artificial wall that imitated the surface of a real mountain and on which most of our competitions are held now.
1. 引导定语从句的是关系代词，如：
The girl who is behind youis my daughter.
因为 who 在从句中充当了主语所以叫关系代词。
2. 引导宾语从句的叫连接代词，如：
I don't know what you name is.
可是这个 what 也充当了从句...
...配中是不是必须要用不定冠词？
He has a good knowledge of mathematics. 他的数学(知识)很好。
He has a wide knowledge of history. 他有广泛的历史知识。
It is necessary to have a good knowledge of the essentials of English grammar. 了解英语语法的一些要素...
Do you want another cake ?No, thank you. ( )A. I still have got some leftB. I've still got some leftC. I still have some onesD. I have still some ones对这道题，我有2个疑问：1）题目中的cake是可数还是不可数？词典释义cake既可数（蛋糕；饼状食物；饼）...
... of 500 taxis navigated by computers, often with
no safety drivers in them for backup1. a fleet of 500 taxis 中a
fleet of 是限定词吗？类似于a lot of？还是说中心词就是fleet?2. with是否表示伴随，还是有其他含义?3. in them成分分析（定状补）?4. for backup成分...
...解释里分别有下面两句话：Used with a singular countable nouns to refer to one of number of
things or people, when it doesn't matter which.还有：In, at or to any place, when it doesn't matter
where.这两句话中单词which和where的位置，我感觉很少见。想请教老师，这...