一、if
從句 主句
與現(xiàn)在相反 did/were would/could/should/might do
與過去相反 had done would/could/should/might have done
did/were;
與將來相反 were to do; would/could/should/might do
should do
1. If I were a bird, I would fly to you. _____
2. If he had followed my advice, he would have succeeded. _____
3. If it rained/were to rain/should rain, I would stay here. _____
注意:
(1). 在if引導(dǎo)的虛擬語氣中,從句部分如果有had, were, should, 可以省略if,
將had, were, should 提前。
將以上三句改為倒裝