根据句意用括号内动词的适当形式填空：1、It is _____(say)that she has been back f

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根据句意用括号内动词的适当形式填空：1、It is _____(say)that she has been back for two weeks.
2、She asked if Mr Smith____already____(come)back.
选择:1.What can i do for you?-----_____you have time ,could you please help me water the flowers? A.whether B.if
2.What if it ____when we are having a picnic?------Of course we should have taken our umbrellas with us. A.will rain B.is raining C.rains D.would rain
大家帮帮忙啊,好的有追加

1.said
2.had come
1.B.2.C
再问：能解释一下是为什么吗
再答： 1.it is said 是固定搭配，意为据说 2.填had come因句中有already,所以用完成时,said是过去完成时常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。如： If you ask him，he will help you．如果你请他帮忙，他会帮你的。 If you fail in the exam，you will let him down．如果你考试不及格，你会让他失望的。 If you have finished the homework， you can go home．如果你作业做完了就可以回家了。
再问：句子后还有has 是现在时，that前后不是应该时态一致吗？此句if不是表是否吗
再答：是的
再问：那为什么前面还要用said，过去式呢？

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