but for与but that区别?句1.he might have lost his daughter( but for) the timely arrival of the policeman.句2.the old woman would have been drowned (but that)a passer-by dragged her out of the water为什么句2不可以用but forbut for 和but th

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but for与but that区别?
句1.he might have lost his daughter( but for) the timely arrival of the policeman.
句2.the old woman would have been drowned (but that)a passer-by dragged her out of the water
为什么句2不可以用but for
but for 和but that有什么区别

but for 后面应该是加短语把,the timely arrival of the policeman,这边重点是 警察的 及时到达.
but that 后面加句子吧,a passer-by dragged her out of the water,一个路人把她从水里拉出来,这是个句子哦.