hadInotdonatedthemoney,theywoundn'thavehadaccesstocleanwater.为什么开头的had这样用,是

Question

had I not donated the money ,they woundn't have had access to clean water.为什么开头的had这样用,是

Answer 1

虚拟条件句的倒装
虚拟条件句的从句部分如果含有were,should,或had,可将if省略,再把were,should或had 移到从句句首,实行倒装.
Were they here now,they could help us.
　=If they were here now,they could help us.
Had you come earlier,you would have met him
　=If you had come earlier,you would have met him.
Should it rain,the crops would be saved.
　=Were it to rain,the crops would be saved.
注意：
在虚拟语气的从句中,动词'be'的过去时态一律用"were",不用was,即在从句中be用were代替.
If I were you,I would go to look for him.
如果我是你,就会去找他.
If he were here,everything would be all right.
如果他在这儿,一切都会好的.
典型例题
　_____ to do the work,I should do it some other day.
A.If were I　　 B.I were　C.Were I　D.Was I
答案C.在虚拟条件状语中如果有were,should,had这三个词,通常将if省略,主语提前,变成 were,should,had +主语的形式.但要注意,在虚拟条件状语从句中,省略连词的倒装形式的句首不能用动词的缩略形式.如我们可说 Were I not to do.,而不能说 Weren't I to do.