The teacher told us ____

A . if he could work out the problem D .that the earth 耽锭槽瓜噩盖茶睡偿精goes around the sun A为什么不对

1.if 可引导状语从句 如果...,假使... a. [就现在,过去,未来可能实现之事加以推测时] If you are tired, we will go straight home 如果你疲倦了,我们就直接回家 If you have finished reading this book, please return it to me 如果你念完这本书,请把它还给我 Do you mind if I open the window? 如果我打开窗子,你介意吗? (我可以打开窗子吗? ) I shall tell him if he comes 如果他来了,我会告诉他2. 用于虚拟语气中 a.If you knew how I suffered, you would pity me 如果你知道我多麽受苦,你会同情我 If I were you, I would help him 如果我是你,我会帮助他 b.If I had known, I wouldn't have done it 假使我知道,我就不会做那件事 If he had followed my advice, he wouldn't be in such difficulty now 如果他听从我的劝告,他现在就不会陷入如此的困境 c. If it should rain tomorrow, I shall not [shan't, won't] come 万一明天下雨,我就不来 3.if可引导宾语从句 ,"是不是..."基本等同于whether Ask him if it is true 问他那是不是真的 I wonder if he is in the school 我不知道他是否在学校 把TOLD 改成ASK 就是第三种情况了，

a

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