连接词
用法
例句
when,
while,
as
when既可表示时间段，也可表示时间点，表示主句和从句的动作同时发生或从句的动作先于主句的动作发生
When she came in, I stopped eating.
When I lived in the countryside, I used to carry some water for him.
while强调主从句的行为或状态同时发生或存在，从句用延续性动词
While my wife was reading the newspaper, I was watching TV.
as通常和when通用，另外它还表示“随着……，一边……一边……”
You can feel the air moving as your hand pushes through it.
Our headmaster laughed as she spoke.
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