Вставьте глагол be в present simple , past simple и future simple tense

1 He isn't at home at the moment.

2 My brother is at school now.

3 Tomorrow my friends will be at the cinema (movies), but not at the theatre.

4 Weren't children at school yesterday?Are they ill?

5 He was a good person.

6 Is grandfather in the garden?Where is he?

7 Where was your sister yesterday evening?

8 Where will you be tomorrow morning?

9 They won't be at the concert tomorrow.

10 When will he be twenty?