กริยา Verb to be

คือ คำกริยาช่วยใน Present Tense (ปัจจุบัน) ใช้ is, am, are (เป็น, อยู่, คือ) แต่ใน Past Tense (อดีต) ใช้ was were (เป็น, อยู่, คือ)
is ใช้กับ He She It และประธานที่เป็นคำนามเอกพจน์

am ใช้กับ I เท่านั้น

are ใช้กับ You We They และประธานที่เป็นคำนามพหูพจน์

EXERCISE 5 (p.4) 

Complete the sentences. Use am, is, or are.

Examples: We are professors. 

                 You are students.

                 They are brothers.

                 Jane and I are sisters.

1. Mr. and Mrs. Carter _are_teachers.

2. I ____ a Student. 

3. You ____ a Student too. 

4. We ____ students.

5. Mrs.Carter ____ a teacher.

6. She ____ an English teacher.

7. You ____ teachers. 

8. It ____ an English book. 

9. They ____ English books.

10. John and I ____ classmates.

11. Mary and Chris ____ classmates.

12. You and Mary ____ classmates too.

Exercise 14 (8)

Complete the sentences. Use subject pronouns, present tense forms of be, and the word not.

Examples: She is not an architect.

                 They are not gardeners.

                 I am not an artist.

1. Mrs Lee is a musician. __She is not__ a singer. 

2. I am a student. ________ a teacher.

3. You and I are students. ________ teachers.

4. Mr and Mrs Chang are computer scientists. ________ engineers.

5. Her brother is an actor. ________ a singer.

6. She and her husband are farmers. ________ gardeners.

7. Mr Sharif is a graduate student. __________ an undergraduate.

8. He and his brother are football players. __________ soccer players.

9. You are a nurse. ________ a doctor.

10. Eric and Pat are flight attendants. ________ pilots.