分词做状语时的否定形式及虚拟语气倒装时的否定形式
1个回答
第二个是正确的,
否定式：非谓语动词的否定式not总是在首位,not + 现在分词
例题：______ a reply,he decided to write again.
A.Not receiving B.Receiving not C.Not having received D.Having not received
析：非谓语动词的否定式not应置于首位,B、D皆为错误形式.A项不能表达先于decided的动作,只有选C项才表没收到信在先,决定再写信在后,所以C为正确答案.
第2个正确,只是把had提前,把if省略,其他不能变
例如：如果虚拟条件句的谓语部分有 were ,had 和 should 时,可省略 if ,把 were ,had 和 should 放到从句主语前面去.
Had you not helped me ,I should have failed.要是没有你的帮助,我就失败了.
Were she younger,she would do it .如果她年青点,她就会干的.
Had he known her address,he would had gone to visit her.如果他知道她的地址,他会去看她的
