`a)` Mary and peter go to work every day

`-` Mary and peter don't go to work every day

`?` Do Mary and peter go to work every day?

`b)` He gets up at 9:00 every morning

`-` He doesn't get up at 9:00 every morning

`?` Does he get up at 9:00 every morning?

`@` Kiến thức thì hiện tại đơn : 

`-` Khẳng định : S + V(s/es) + .....      

`-` Phủ định : S + don't/doesn't + V .......

`-` Nghi vấn : Do/does + S + V ? 

`1`.
(-) Mary and Peter don't go to work every day
(?)Do Mary and Peter go to work every day?
------------------------------------
`2`.
(-) He doesn't get up at 9:00 every morning
(?) Does He get up at 9:00 every morning?
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Cấu trúc của thì HTĐ:
(+)S+V(s/es)+O
(-)S+don't/doesn't+V+O
(?)Do/does+S+V+O?
=> Đối HE/SHE/IT/DANH TỪ SỐ ÍT.......+V(S/ES)
=> ĐỐI VỚI I/WE/THEY/DANH TỪ SỐ NHIỀU.....+V(nguyên mẫu)
=> DHNB:Every day,on Monday,usually,..................