`5`. My uncle/ use/ drive careless/ some years ago.

`6`. We/ should/ wait/ the traffic lights/ turn green/ we cross/ the street. 

`5)` My uncle used to drive carelessly some years ago.

`->` some years ago `=>` QKĐ

`->` S + used to V-inf ... : ai từng làm gì

`->` V + adv

`6)` We should wait for the traffic lights to turn green before we cross the street.

`->` should + V-inf: nên làm gì

`->` wait for sb/sth to V-inf: đợi cho ai/cái gì làm gì

`->` before: trước khi

`->` S + V-s/es + ... ; we là số nhiều `=>` V-inf

`-`

@magnetic

`5,` My uncle used to drive carelessly some years ago.

- used to do sth: đã từng làm gì đó

- Verb + Adv

- some years ago -> DHNB thì QKĐ

- QKĐ: S+ V2/V-ed +O 

`6,` We should wait for the traffic lights to turn green before we cross the street.

- should + V-inf: nên làm gì đó 

- wait for sth: chờ đợi cái gì