Enough:

– S + tobe + adj + enough + (for fb) + to Verb

VD: She is old enough to drive a car.

– S + V + adv + enough + (for SB) + to Verb

VD: I study hard enough to get a good mark.

- S + V + enough + noun + (for sb) + to Verb

VD: I don't have enough money to buy a book.

Be going to:

S + be + going to + V(bare)

VD: I am going to pick you up,

My mother is going to buy a new house.

Used to:

(+) S + used to + V(bare)

(-) S + didn't + use to + V (bare))

(?) Did + S + use to + V(bare) ?

VD: I used to go to shool on foot when I was in primary school.

I didn't use to eat this dish 2 years ago,

Công thức enough

-Cùng chủ ngữ:S+be(not)+adj+enough+to V+...

-Khác chủ ngữ:S+be(not)+adj+enough+for(O)+to V

Vd:Ba is not old enough to drive a car

The weather was fine enough for us to go camping

Công thức Be going to

-S+be+going to+V_infinitive

Vd:Nga is going to see a movie

They are going to fishing

Công thức Used to

-Khẳng định:S+used to+V_infinitive..

_Phủ định:S+didn't use to+V_infinitive..

-Nghi vấn:Did+S+use to+ V_infinitive..

Vd:I used to have a cat

They used to live in Hue