A as(=when/while)的用法的限制

　　这里as主要与表示动作或发展过程的动词连用，一般情况下它不与第168节中所列的动词连用，除如上面B3所示有发展之意时例外。在一般情况下它也不与live，stay，remain这类动词连用。

　　B as与上述动词或同类动词连用时，一般均表示because/since (由于)：

　　As he was tired相当于：

　　Because he was tired...

　　因为他太累了

　　As he knew her well相当于：

　　Because he knew her well

　　因为他了解她

　　As it contains alcohd...相当于：

　　Since/Because it contains alcohol

　　因为它含有酒精

　　As he lives near here相当于：

　　Since/Because he lives

　　因为他住的地方离这儿很近

　　C as与多数动词连用时，可以是两种意思中的任一个意思：

　　As/While he shaved he thought about the coming interview.

　　他边刮胡子，边想着即将进行的面谈。

　　As/Because he shaved with a blunt razor he didnt make a very good job of it.

　　因为他用一把钝剃须刀刮胡子，所以刮得不好。

　　如果在这个问题上没有把握，最好用while或because。

　　D as+名词时意为when/while(当时)或because/since(由于)：

　　As a student he had known great poverty.相当于：

　　When he was a student he had known great poverty.

　　他当学生时，经历过很贫困的生活。

　　As a student he gets/got in for half price.相当于：

　　Because he is/was a student be gets/got in...

　　由于是学生，他付半价就入场了。

　　As a married man，he has to think of his family.相当于：

　　Because/Since he is a married man...

　　作为一个有妇之夫，他必须考虑他的家庭。

　　as在这里意为 when/while时，后面常跟完成时态。

　　as意为because/since时，后面可跟任一时态。

　　A as(=when/while)的用法的限制

　　这里as主要与表示动作或发展过程的动词连用，一般情况下它不与第168节中所列的动词连用，除如上面B3所示有发展之意时例外。在一般情况下它也不与live，stay，remain这类动词连用。

　　B as与上述动词或同类动词连用时，一般均表示because/since (由于)：

　　As he was tired相当于：

　　Because he was tired...

　　因为他太累了

　　As he knew her well相当于：

　　Because he knew her well

　　因为他了解她

　　As it contains alcohd...相当于：

　　Since/Because it contains alcohol

　　因为它含有酒精

　　As he lives near here相当于：

　　Since/Because he lives

　　因为他住的地方离这儿很近

　　C as与多数动词连用时，可以是两种意思中的任一个意思：

　　As/While he shaved he thought about the coming interview.

　　他边刮胡子，边想着即将进行的面谈。

　　As/Because he shaved with a blunt razor he didnt make a very good job of it.

　　因为他用一把钝剃须刀刮胡子，所以刮得不好。

　　如果在这个问题上没有把握，最好用while或because。

　　D as+名词时意为when/while(当时)或because/since(由于)：

　　As a student he had known great poverty.相当于：

　　When he was a student he had known great poverty.

　　他当学生时，经历过很贫困的生活。

　　As a student he gets/got in for half price.相当于：

　　Because he is/was a student be gets/got in...

　　由于是学生，他付半价就入场了。

　　As a married man，he has to think of his family.相当于：

　　Because/Since he is a married man...

　　作为一个有妇之夫，他必须考虑他的家庭。

　　as在这里意为 when/while时，后面常跟完成时态。

　　as意为because/since时，后面可跟任一时态。