肯定句:I slept until midnight. 我一直睡到半夜时醒了。Wait till I call you. 等着我叫你。(在肯定句中可用before代替 Let’s get in the wheat before the sun sets.)
否定句:She didn’t arrive until 6 o’clock.她直到6点才到。Don’t get off the bus until it has stopped.公共汽车停稳后再下车。I didn’t manage to do it until you had explained how. 直到你教我后,我才会做。
1)Until可用于句首,而till通常不用于句首。Until you told me, I had heard nothing of what happened.直到你告诉我以前,出了什么事我一点也不知道。2)Until when 疑问句中,until要放在句首。—Until when are you staying?你呆到什么时候?— Until next Monday.呆到下周一。
注意:否定句可用另外两种句式表示。(1)Not until …在句首,主句用倒装。Not until the early years of the 19th century did man know what heat is.直到19 世纪初,人类才知道热能是什么。Not until I began to work did I realize how much time I had wasted.直到我开始工作,我才认识到了我已蹉跎了几多岁月。(2)It is not until… that…