1
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Verb to be. The verb to be can be used as a main verb or as an auxiliary verb.

2
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Main verb. It is tired.

3
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Auxiliary verb. We are walking outdoors.

4
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The verb to be can be affirmative, negative and interrogative.

5
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Hello, I am Luffy.

6
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Hello, I'm Paul.

7
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I'm 8 years old.

8
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Are you 8 years old?

9
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No, I am not 8 years old.

10
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I am 7.

11
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Forming the verb to be in the present simple affirmative

12
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Subject, pronoun, and verb, and complements

13
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We are happy!

14
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Forming the verb to be in the present simple negative

15
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Subject, pronoun, and verb, and not, and complements

16
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We are not hungry

17
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Forming the verb to be in the present seems affirmative

18
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Verb and subject pronoun and compliments and question mark

19
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Are we late for class?