Youd better turn off the lights when they are not in use. The light

`1. ` The light had better be turned off when they are not in use.

gt:

Had better - V = Should V: nên làm gì

turn off st: tắt cái gì

in use: đang dùng

cấu trúc câu bị động thì HTĐ:

S-be/is/am/are (not) - VpII