A 只有在形容词+as+主语+to be/to seem/to appear这一结构中,as才意为though/although(尽管):
Tired as he was he offered to carry her.相当于:
Though he was tired he offered to carry her.
尽管他很累了,他还主动提出要背着她。
Strong as he was,he couldnt lift it.
尽管他力气很大,他仍提不起这个东西。
B while可意为but,用于表示强调对比:
At seameanson a ship,whileat the seameansat the seaside.
At sea意为在船上,而at the sea意为在海滩上。
Some people waste food while others havent enough.
一些人糟踏食物而另一些人却食不果腹。
while可以意为although,这时常放在句首:
While I sympathize with your point of view I cannot accept it.
尽管我认同你的观点,但我不能接受它。
C when可以意为seeing that/although(鉴于)。因此它同while 很相似,但主要用于引导使另一个动作显得不合理的陈述句。
它常用在一个问句里,但不是一定如此:
How can you expect your children to be truthful when you yourself tell lies?
你自己都在撒谎,怎么能指望你的孩子们诚实?
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2016-02-29
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