ESL worksheet focusing on the verb 'to be' (positive) with exercises to complete sentences using 'am', 'are', or 'is'.

Task Explanation:

The task involves filling in the blanks with the correct form of the verb "to be" (i.e., am, are, or is) based on the subject of each sentence. The rules for using these forms are as follows:

- I → am
- You → are
- He, She, It → is
- We, They → are

Solution:

Let's go through each sentence and fill in the blanks with the appropriate form of the verb "to be."

---

#### 1. I ( ) a student.
- Subject: I
- Correct form: am
- Sentence: I am a student.

#### 2. He ( ) hungry.
- Subject: He
- Correct form: is
- Sentence: He is hungry.

#### 3. She ( ) happy.
- Subject: She
- Correct form: is
- Sentence: She is happy.

#### 4. We ( ) late.
- Subject: We
- Correct form: are
- Sentence: We are late.

#### 5. They ( ) from England.
- Subject: They
- Correct form: are
- Sentence: They are from England.

#### 6. It ( ) very cold today.
- Subject: It
- Correct form: is
- Sentence: It is very cold today.

#### 7. She ( ) in the living room.
- Subject: She
- Correct form: is
- Sentence: She is in the living room.

#### 8. We ( ) playing computer games.
- Subject: We
- Correct form: are
- Sentence: We are playing computer games.

#### 9. He ( ) watching TV.
- Subject: He
- Correct form: is
- Sentence: He is watching TV.

#### 10. I ( ) not feeling well.
- Subject: I
- Correct form: am
- Sentence: I am not feeling well.

#### 11. It ( ) a tiger.
- Subject: It
- Correct form: is
- Sentence: It is a tiger.

#### 12. I ( ) 24 years old.
- Subject: I
- Correct form: am
- Sentence: I am 24 years old.

#### 13. She ( ) from France.
- Subject: She
- Correct form: is
- Sentence: She is from France.

#### 14. We ( ) friends.
- Subject: We
- Correct form: are
- Sentence: We are friends.

#### 15. You ( ) a teacher.
- Subject: You
- Correct form: are
- Sentence: You are a teacher.

#### 16. He ( ) late.
- Subject: He
- Correct form: is
- Sentence: He is late.

#### 17. I ( ) very thirsty.
- Subject: I
- Correct form: am
- Sentence: I am very thirsty.

#### 18. She ( ) Spanish.
- Subject: She
- Correct form: is
- Sentence: She is Spanish.

#### 19. It ( ) so hot.
- Subject: It
- Correct form: is
- Sentence: It is so hot.

#### 20. Chris ( ) 20 today.
- Subject: Chris (singular)
- Correct form: is
- Sentence: Chris is 20 today.

---

Final Answer:

```
1. I am a student.
2. He is hungry.
3. She is happy.
4. We are late.
5. They are from England.
6. It is very cold today.
7. She is in the living room.
8. We are playing computer games.
9. He is watching TV.
10. I am not feeling well.
11. It is a tiger.
12. I am 24 years old.
13. She is from France.
14. We are friends.
15. You are a teacher.
16. He is late.
17. I am very thirsty.
18. She is Spanish.
19. It is so hot.
20. Chris is 20 today.
```

Final Answer Boxed:
\boxed{
\begin{aligned}
&1. \text{I am a student.} \\
&2. \text{He is hungry.} \\
&3. \text{She is happy.} \\
&4. \text{We are late.} \\
&5. \text{They are from England.} \\
&6. \text{It is very cold today.} \\
&7. \text{She is in the living room.} \\
&8. \text{We are playing computer games.} \\
&9. \text{He is watching TV.} \\
&10. \text{I am not feeling well.} \\
&11. \text{It is a tiger.} \\
&12. \text{I am 24 years old.} \\
&13. \text{She is from France.} \\
&14. \text{We are friends.} \\
&15. \text{You are a teacher.} \\
&16. \text{He is late.} \\
&17. \text{I am very thirsty.} \\
&18. \text{She is Spanish.} \\
&19. \text{It is so hot.} \\
&20. \text{Chris is 20 today.}
\end{aligned}
}