1, It has rained since 2 o'clock.
2, I started learning Chinese two years ago.
3, He started collecting stamps five years ago.
4, She has learned English for 8 months.
5, They have worked for the enterprise since 2002.
6, They began to play tennis last year.
7, They started working in that factory in 2001.
8, We have lived here for fifteen years.
9, Minh has collected stamps since 2000.