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2 They're going to watch a film.

3 She"s going to make a salad.

4 He's going to wash his car.

5 They're going to play tennis.

6 Mary's going to win the race.

Тут объяснения особого нет.Кроме того,что надо знать формы глагола to be.

İ am

He,she,it is

We ,you,they are

А перевод to be going to-собираться что-то делать.