1. This (be) is my friend, Lan .
2. Is She (be) nice ?
3. They (not be) aren't students.
4. He (be) is fine today.
5. My brother (not be ) isn't a doctor.
6. Are You (be) Nga ? Yes, I (be) am
7. The children (be) are in their class now.
8. Are They (be) workers ? No, They (not be) aren't
9. Her name (be) is Linh.
10. How are you (be) ? – We (be) are fine, thanks.
$-----$
Thì hiện tại đơn (với tobe):
$(+)$
He, she, it/ N(số ít) + is
I + am
We, you, they/ N(số nhiều) + are
$(-)$
He, she, it/ N(số ít)+ is + not (isn't)
I + am + not
We, you, they/ N(số nhiều) + are + not (aren't)
$(?)$
Is + he, she, it/ N(số ít) + ...?
Am + I + ...?
Are + we, you, they/ N(số nhiều) + ...?