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) + ...?

Bài 4.

1. is

2. Is she

3. aren't

4. is

5. isn't

6. Are - am

7. are 

8. Are they - aren't

9. is

10. are you - are 

`->` He / she / it + is + N/Adj

`->` I + am + N/Adj

`->` We / they / you + are + N/Adj