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Утвердительные:
1. She is so tired to do her homework.
2. If the weather were fine, he would go for a walk.
3. You ought to read more to be clever.
4. The book "The adventures of Tom Sawyer" was my favourite one.
5. I was overwhelmed with fellings after watching this film.

Отрицательные:
1. Today jazz isn't a number one hit.
2. The concert wasn't beyond my expectations.
3. My father isn't romantic at heart.
4. It's not a real treat to us.
5. I'm not glad that you aren't so polite.

Вопросительные:
1. He asked what were my preferences in music?
2. Is his voice so tender and lyrical?
3. Is there any chance to get it?
4. Was there a great choice of clothes?
5. Were they a regular readers?

1. — Are they living in London? (Они живут в Лондоне?)

— Yes, they are.

2. —  Is she your best student at school? (Она твоя лучшая ученица в школе?)

— No, she isn't. My best student is Michael.

3. Is he busy now?

— Yes, he is. He is sorting important documents now.

4. — Are you ready to go to the store?

—  No, i'm not. I'm doing my homework.

Объяснение:

Для начала, вы должны знать, что глагол to be содержит в себе формы данного глагола в настоящем времени:

1. — am (форма 1-го лица, единственного числа, употребляется с местоимением I)

2. — is (форма 3-го лица, единственного числа, употребляется с местоимениями he, she, it, а также с любыми именами и предметами в единственном числе)

3. — are (форма множественного числа в настоящем времени, употребляется с местоимениями you, You (вежливая форма обращения), we и they, а также с существительными во множественном числе)