时间段+after构成符合连词引导时间状语从句，这是一个很少被语法界论述的高级句型，请看经典例句：
Three billion years after life began, the earth is now the home to many different kinds of living things.
在生命开始30亿年后,地球如今是许多不同种类的生物的生息地。
Three billion years after就是个符合连词，引导时间状语从句。
为了把时间关系说得更加精确,在after 从句之前可加上修饰语,诸如just, right, immediately, some time, a long time, soon, three years, many days 等等构成复合连词，引导时间状语从句，再如：
Come over right after you've finished working.
你干完活后马上过来。
I will write to you right after I got there.
我到了那边马上就给你写信。
The agreement takes effect right after it is signed.
协议一经签字立即生效。
Yellen is likely to address the issue right after she pushes unemployment below 6%, stabilizes markets and makes sure that the recovery is more inclusive and robust.
耶伦很可能在将失业率推到6%以下、稳定市场并确保复苏更具包容性和活力之后立即解决这个问题。
六级真题- 2015年 6月
I got in touch with him immediately after I received the letter.
我接信后马上和他联系。
He put the lunch on immediately after he came home.
一回到家他就开始做饭。
Immediately after I got to the station; he arrived.
我前脚到车站，他后脚就赶到了。
He came to see you just after you left.
你刚走，他跟脚儿就来找你。
I found the letter two weeks after he had left.
他离开两周后,我才发现这封信。
She went abroad two years after she graduated.
她毕业两年后出国去了。
Some time after they got there, the ghost in armor suddenly appeared out of the darkness.
在他们到达后不久，身穿盔甲的鬼魂出现在黑暗里。
He and Liz became lovers soon after they first met.
他和莉兹初次见面后不久就成了情侣。
She sold the house soon after her husband died.
丈夫去世后不久，她就把房子卖了。
The interpolation appears to have been inserted very soon after the original text was finished.
插补文字似乎是在原文完成后不久被补充进来的。
The young disappeared soon after they were hatched.
雏鸟出壳后不久就不见了。
The play gripped the audience soon after it started.
剧一开始就抓住了观众。
The plane was hijacked soon after it took off.
那架飞机起飞后不久便被劫持了。
The road will be opened again in a few hours after police have cleared it.
待警察清理完以后，道路在几小时内就会重新开放。
Nine hours after he lost his ski, he found a team of workers who came to save him. He was safe!
弄丢滑雪板九个小时后，他发现一队工人来救他，他安全了！
中考真题- 2015 杭州
The all clear was sounded about 10 minutes after the alert was given.
警报发出10分钟后又响起解除的信号。
Five minutes after he had arrived for the interview, I had abandoned my preconceived ideas about boxers
他到达采访地点不过5分钟，我就摒弃了自己对拳击手的那些成见。
Minutes after the last movie ended yesterday at the Plaza Theater, employees were busy sweeping up popcorns and gathering coke cups ．
最后一部电影昨天在广场剧院结束，几分钟后,员工们正忙着清扫爆米花和捡可乐杯。
高考真题- 2017
Six months after Bud died, the house burned down
巴德死后6个月，这座房子被烧毁。
Five months after Nick had left her, she married another man on the rebound.
尼克离开她5个月后，她心灰意冷地嫁给了另外一个男人。
Coca-Cola Classic returned to store shelves just three months after the "New Coke" was released.
“经典可口可乐”在“新可乐”上市后的短短三个月就又回到了商店的货架。
六级真题- 2017年 12月
Only a few months after the man left, all the swans left.
就在那人离开几个月后,所有的天鹅都离开了。
中考真题- 2016 呼和浩特
Its monthly reports on program trading usually come out about three weeks after each month ends
程式交易月度报告通常在每月结束3周后出来。
He only came out of hiding ten years after the war was over.
战争结束十年之后他才露面。
Several years after they'd split up they met again by chance in Paris.
他们分手几年以后在巴黎又偶然相遇。
The crash happened seconds after the pilot reported engine trouble.
飞行员报告发动机有故障后几秒钟飞机就坠毁了。
The rocket crashed a few seconds after it left the ground.
火箭离开地面几秒钟便坠毁了。
Models eating tissues or cotton balls to hold off hunger, and models collapsing from hunger-induced heart attacks just seconds after they step off the runway.
模特们吃面纸或棉球来抵挡饥饿，模特们因饥饿引起的心脏病发作，仅在他们离开T台后的几秒钟。
四级真题- 2016年 12月 2卷 阅读B