eat the fried meat ___it is hot.It tastes better .选 while/when /as

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eat the fried meat ___it is hot.It tastes better .选 while/when /as
eat the fried meat ___it is hot.It tastes better .选 while/when /as

eat the fried meat ___it is hot.It tastes better .选 while/when /as
eat the fried meat while it is hot.It tastes better .
选 while

while吃肉要趁热

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选AS
as的意思是“正当„„时候（just as，at the same moment that）”“随着„„(while，when)”,它既可表示一个具体的时间点，也可以表示一段时间。
as可表示主句和从句的动作同时发生或同时持续，即“点点重合”“线线重合”；又可表示一个动作发生在另一个动作的持续过程中，即“点线重合”，但不能表示两个动作一前一后发生。
1、As I got on the bus，he got off.我上车，他下车。
（点点重合）
2、He was writing as I was reading.我看书时，他在写字。
（线线重合）
3、The students were talking as the teacher came in.老师进来时，学生们正在讲话。
（点线重合）

二、while的意思是“在„„同时（at the same time that )“在„„期间(for as long as, during the
time that）”。从while的本身词义来看，它只能表示一段时间，不能表示具体的时间点。在时间上可以是“线线重合”或“点线重合”，但不能表示“点点重合”。例如：
1、He was watching TV while she was cooking. 她做饭时，他在看电视。
（线线重合）
2、He was waiting for me while I was working.我工作的时候，他正等着我。
（线线重合）
3、He asked me a question while I was speaking.我在讲话时，他问了我一个问题。
（点线重合）

三、when的意思是“当„„时候（at the time that ）”“无论什么时候（whenever）”“一„„就„„（
as soon as ）”“在„„以后（after）”。它表示的时间概念比较广泛，上述例句中的as或while
均可用when代替，因为when不但可以表示具体的时间点，而且也可以表示一段时间。在时
间上它既能表示“点点重合”“线线重合”，又能表示“点线重合”
。例如：

1、When he came in，she went out.他进来，她出去。
（点点重合）
此句中when从句的动作表示的是一个时间点，when
可以用as代替，但不能用while代替。
2、When he came back，I was doing some washing. 他回来时，我在洗衣服。
（点线重合）
此句中when从句的动作表示的是一个时间点，所以只能用as代替，不能用while
代替。
3. When Mary was writing a letter, the children were playing outside. 玛丽写信时，孩子们都在外面玩。
（线线重合）
此句中的when从句的动作表示的是一段时间，故可用as或while代替。

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