Làm hộ với ạ.

`color[red}{#lgdr}`

`13` When did you ride a bicycle `?`

`14` When did he write to you `?`

`15` How long is it since he talked to you `?`

`@` How long is it + since + S + V(quá khứ) + O `?` : Đã bao lâu kể từ khi ai đó làm gì .

`@` When + did + S + V-inf + O `?` Ai đó đã làm gì từ khi nào `?`

13

When did you ride a bicycle

?

14

When did he write to you

?

15

How long is it since he talked to you ?