9. One 了:V+了+Time duration
(Completed action)
“我在中國教了五年,在美國教了九年了。”
I. I studied French for three years in high
school.
2. Before I came to the U.S., I taught for four
years in China.
3.He lived in Beijing for two years.
4. I did homework for three hours.
5. I rode the subway for one hour.
6. I watched movies for two and half hours.
10. Two 了: V+了+Time duration +了
(Ongoing action)
I. I have studied French for three years in high
school.
2. I have taught for four years in collge.
3.He has lived in Beijing for two years.
4. I has done homework for three hours.
5. I have been riding the subway for one hour.
6. I have watched movies for two and half hours.
7. He has lived in the dorm for two years.