1 .

(+) Minh usually speaks English with his friends 

(-) Minh doesn't usually speak English with his friends 

(?) Does Minh usually speak English with his friends

2 .

(+) They always study English in their class

(-) They don't always study English in their class

(?) Do they always study English in their class

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=> cấu trúc hiện tại đơn

(+) S+V(s/es)

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

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

1. Minh usually speaks English with his friends

   Minh doesn't usually speak English with his friends

   Does Minh usually speak English with his friends?

2. They always study English in their class

    They don't always study English in their class

    Do they always study English in their class ?

$$\textit{Structure}$$ :

(+) S + V-inf/es/s + ...

(- ) S + don't/doesn't + V-inf + ...

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

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