I bumped into my ex-boyfriend days ago. 我几天前无意间撞见了我的前男友。
Marry dropped out of school months ago. 玛丽几个月前辍学了。
We settled down in New York 2 weeks ago. 两星期前我们在纽约定居下来。
2. 多少年，多少天以后，用介词“in”，如：几年后：in years, in a couple of years, 5个月后：in 5 months, 10天后：in 10 days:
I’ll let you know our final decision in a week. 一个星期后，我会通知你我们的最后决定。
We’re moving to Guangzhou in 2 days. 两天后，我们就要搬去广州了。
3. 在。。。时间以内： within, within 2 weeks, within one year, within 7 months
The quotation is subject to your confirmation by fax within one week.
此报价以你以传真形式在一周内确认为有效。
4.“before”, ”after”这两个词怎么用呢?，它们的后面可以接从句，：“before” 在某事发生之前，”after”在某事发生之后：
I was only a clerk before I came to Guangzhou. 在我来广州之前,我只是个小文员.
We went to a concert after we finished our work. 我们下班后去听了音乐会.
“before”, ”after”这两个词后面还可以接名词：
