Have (мн. ч.) they got a computer? Yes, they have (на какое слово вопрос начинается, на то и ответ заканчивается).
Has (3е лицо) he got a sister? No, he hasn't.
Has (3е лицо) Tom got a pen in his school bag? Yes, he has.
Have (2е лицо) you got a computer? No, I haven't.
Have (мн. ч.) they got a computer? Yes, they have (на какое слово вопрос начинается, на то и ответ заканчивается).
Has (3е лицо) he got a sister? No, he hasn't.
Has (3е лицо) Tom got a pen in his school bag? Yes, he has.
Have (2е лицо) you got a computer? No, I haven't.