untill和till的区别和用法

?

的结构，如果将

< /p>

?

的结构放在句 首，那么主句要写成倒装句。例如：

They didn't realize their fault untill we pointed it out to them .

直到我们向他们指出了他们的错误，他们才意识到。

Not until we pointed out their fault to them did they realize it .

直到我们向他们指出了他们的错误，他们才意识到。

The students

made

much noise till the teacher came into the classroom .

直到老师走进教室学生们才停止了大声喧哗。

基本结论：

因此此两个连词意义相同 。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

。

1)Unti l

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…