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do
did
What did you do?
go
went
I went home.
fall
fell
I fell down.
Did you ...？ Yes, I did./No, I didn’t.
助动词是照妖镜，
后面动词现原形。
Did you fall off your bike？ Yes, I did./No, I didn’t.
Did you ...football？（play﹨played ） Yes, I did./No, I didn’t.
ride a bike 骑自行车
a bike ride 骑自行车
go for a bike ride
去骑自行车
Sam and I went for a bike ride yesterday.