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（1）The bell is rung if there is a fire.

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（1）The bell is rung if there is a fire.
问：为什么用is,不用将来时will be rung啊,不是主将从现吗?
（2）I have taken care of your children ____ you were away.
问：横线上填since 还是while 答案是while 可我觉得since 也没什么不对啊?讲讲理由啊,本人感激不尽!
（1）表一种事实存在的常态,表示如果有火灾,铃声就会响,不是这个事情存在一会,就没了,不只是将来发生而已,而是一直存在的一种状态包括现在和将来都是这样的,所以用is,有时候做这种题不要纯粹的用语法来分析,像这种题,用语感一读就出来了,根本不需要考虑什么原因,所以多读英语,多练,这种题就是小case!
同理 第二题,语感一读就知道是While,此时的While相当于When,表示当...什么时候,而Since没有这样意境!
（1）The bell is rung if there is a fire. The bell is ring _there is a fire A even B that C if D altho 例：The bell is ringing.The bell has just rung.则：He is having the bell is ringing可否改写为the bell has just rung The bell is ringing和The bell had just rung有什么区别? 英语题目the fire alarm will ring if there is a fire (will ring划线 The bell will ring.There will be a fire.(用if连接) there is the bell.英译汉 Don't use the lift if there is fire What will you do if there is a fire in the kichen是什么意思 1.What will you do if there is a fire in the kitchen? what will you do if there is a fire in the kitchen什麽意思