Как правильно нужно задать вопрос на это? кроме who is thet? меняется ли thet? в зависимости от множественного единственного числа?

Правильней будет who is it? нет не меняется

Первое задание.

I have got a new school bag. There is a new pencil case in it and there are new books too. and we have got a new teacher! her name is Anna Olegovna. she is very kind. she is thin and shehas got fair hair and green eyes. We like her and she likes us. I've got some new friends. we play games after school. It's fun! what about you? have you got any new teachers or friends?

Второе задание.

1) What's your favourite subject?
2) This is my big brother
3) Does your mum watch cartoons?
4) My friends don't like hot milk
5) Have they got some cheese sandwiches?
6) Can I have some more cake, please?
7) Whose is this aeroplane?
8) Those are my toys.
9) The baby has got one tooth
10) The cat is under the car
11) Is there an armchair in your bedroom?
12) Are the children making a sandcastle?

I. Поставьте глагол в Past Simple:
1. I bought a blue mobile phone last week.
2. He met Mary at the station last Monday.
3. Helen cooked dinner yesterday.
4. When did you write to your parents last time?
5. Yesterday Mr. Watson drank tea with his friends.

II. Поставьте глагол в Past Continuous:
1. She was swimming the whole morning yesterday.
2. He was watching TV from 5 to 8 p.m. last Sunday.
3. They were running in the park at 6 p.m. yesterday.
4. My children were sleeping from 2 to 4 p.m. yesterday.
5. I was making a cake the whole evening last Friday.