1) I ride a bike every summer 2) I'm ridding a bike now 3) I have just ridden a bike 4) I have been riding a bike for two hours 5) I rode the bike yesterday 6) I was riding a bike while my mother was cooking 7) I had ridden a bike before I started doing my homework 8) I had been ridding a bike for two hours before she came 9) I'll ride a bike tomorrow 10) I'll be ridding a bike tomorrow at two o'clock 11) I'll ridden a bike after doing homework 12) I'll be ridding a bike for two hours after she comes
2) I'm ridding a bike now
3) I have just ridden a bike
4) I have been riding a bike for two hours
5) I rode the bike yesterday
6) I was riding a bike while my mother was cooking
7) I had ridden a bike before I started doing my homework
8) I had been ridding a bike for two hours before she came
9) I'll ride a bike tomorrow
10) I'll be ridding a bike tomorrow at two o'clock
11) I'll ridden a bike after doing homework
12) I'll be ridding a bike for two hours after she comes