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这两个连词意义相同。肯定形式表示的意思是“做某事直至某时”,动词必须是延续性的。否定形式表达的意思是“直至某时才做某事”,延续性或非延续性动词都可以。 正确使用这两个连词的关键就在于,判断句中的动词该用肯定式还是否定式。
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until。如: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?
你待到什么时候?
—Until next Monday.
待到下周一。
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.
直到开始工作,我才认识到自己已蹉跎了多少岁月。
2.It is not until... that...
It is not until I began to work that I realized how much time I had wasted.
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until。如: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?
你待到什么时候?
—Until next Monday.
待到下周一。
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.
直到开始工作,我才认识到自己已蹉跎了多少岁月。
2.It is not until... that...
It is not until I began to work that I realized how much time I had wasted.