`1`.Mr. and Mrs.Smith are travelling to Ha Noi by plane now

`\rightarrow` Thì HTTD : S + be + V-ing

`\rightarrow` Đặc điểm nhận dạng : now

`2`.Van used to have a motorbike once

`\rightarrow` `\text{S + used to + V :}` Đã từng

`3`.My father usually drives to work

`\rightarrow` Thì HTĐ : S + V s / es 

`\rightarrow` Đặc điểm nhận dạng : usually

`4`.This part of the city didn't use to have traffic jams very often

`\rightarrow` `\text{S + didn't use to + V :}` Không từng

`5`.I used to go to school on foot when I was young

`\rightarrow` `\text{S + used to + V :}` Đã từng

`\text{@ TheFox}`