Помогите номер 4 пожалуйста.
11.I phoned my grandparents last night.I wanted to invite them to ur Christmas dinner.
12.My mother is organising a party.She wants to celebrate my birthday.
(Если что это продолжение)​

2 Peter has a part-time job to get some extra money.

3 My mother went to the post office topost some letters.

4 Mary stayed at school until 9 p.m. to finish her History project.

5 Peter sent Mary an e-card to wish her a "Happy Birthday".

6 Peter did some sport to lose weight.

7 She's gone to the supermarket to buy some sugar.

8 Daisy is studying hard to be a doctor.

9 They have gone to town to buy new boots.

10 We are on a diet to get thinner.

11 I phoned my grandparents last night to invite them to our Christmas dinner.

12 My mother is organising a party to celebrate my birthday.