Помогите с английским

Можно пожалуйста с объяснением заранее спасибо
По дате
По рейтингу
Is Tom a doctor? - Yes,he is / No, he isn't
Tom is not a doctor.
2. Are they students? - Yes, they are / No,they aren't
They are not students.
3. Is he at school? - Yes, he is / No,he isn't
He is not at school.
4. Is this my pen? - Yes, it is / No,it isn't
This is not my pen.
5. Are these tables? - Yes, they are/ No, they aren't
These are not tables.
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