`-` Minh doesn't usually sleep at weekends 

`-` Do you understand the questions from your steacher?

`-` Her husband and his colleague play tennis whenever they are free 

`-` My family normally eats breakfast at 6.30

`-` Sam doesn't phone her mother on Sundays

-------------------------------------------------------------

`=>` Cấu trúc thì hiện tại đơn:

`(+)` S+V(s/es)

`(-)` S+do/does+not+V-inf

`(?)` Do/does+S+V-inf

`-` I/you/we/they/danh từ số nhiều+V-inf

`-` He/she/it/danh từ số ít/danh từ không đếm được+V-s/es

`-` do not=don't

`-` does not=doesn't

`DHNB`: 

`-` every day/week/month...

`-` daily/weekly/monthly....

`-` các trạng từ tần suất: always,usually,often,never...

`-` once/twice/three...times a day/week/month...