till和until在很多情況下都可以互換使用。不能互換的情況如下:
(1) not...until...句子結(jié)構(gòu)中,until不能改為till。
例如:
1. It was not until the film had begun that he arrived. 直到電影開(kāi)始他才到。
2. It is not until 8:00 that we begin our class every day. 我們每天八點(diǎn)開(kāi)始上課。
(2) Not until放在句首時(shí),句子要倒裝,其中的until不能改為till 。
例如:
1. Not until the last moment did he change his mind. 直到較后一刻他才改變主意。
2. Not until midnight did it stop raining. 直到午夜雨才停。
(3) 句首通常只用until,不用till。
例如:
1. Until then, I knew nothing at all about it. 在那之前,我對(duì)此事一無(wú)所知。
2. Until you told me I had no idea of it. 在你告訴我之前,我對(duì)此一無(wú)所知。