13. We are going to go out this weekend.

(-) We aren't going to go out this weekend

(?) Are they going to go out this weekend?

14. Their parents are going to have a meeting on Saturday.

(-) Their parents aren't going to have a meeting on Saturday.

(?) Are their parents going to have a meeting on Saturday?

15. It is going to snow in Brighton tomorrow evening.

(-) It isn't going to snow in Brighton tomorrow evening.

(?) Is it going to snow in Brighton tomorrow evening?

Have a nice day!!!

* near future tense : thì tương lai gần 

(+) S + is/ am/ are + going to + V(nguyên thể)
(-) S + is/ am/ are + not + going to + V(nguyên thể)
(?) Is/ Am/ Are + S + going to + V(nguyên thể)?
Áp dụng

13 we are going to go out this weekend 

(-) We aren't going to go out this weekend

(?) Are we going to go out this weekend ?

14 their parents are going to have a meeting on Saturday

(-) their parents aren't going to have a meeting on Saturday

(?) Are their parents going to have a meeting on Saturday?

15 It is going to snow in Brighton tomorrow evening 

(-) It isn't going to snow in Brighton tomorrow evening

(?) Is It going to snow in Brighton tomorrow evening 

`@phamducanh2476`