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The verb be (am - is - are) may be  a main verb or auxilary verb.

be as a main verb in the Simple Present (am, are, is)

positive	negative
I: I am sick today.	. I am not sick today.
he, she, it: He is sick today. She is happy. It is cold.	. He is not sick today. She is not happy. It isn't cold.
we, you, they: We are sick today. They are at home. You are late.	. We are not sick today. They are not at home. You are not late.

   
    be as a main verb in the Simple Past (was, were)
  

positive	negative
I, he, she, it: I was late. She was very sad. He was sick. It was rainy.	. I was not late. She was not very sad. He was not sick. It was not rainy.
we, you, they: We were here. You were here. They were here	. We were not here. You were not here. They were not here.

  

to be verb as an auxiliary verb in the Present Continuous Tense(am, are, is)

positive	negative
I: I am watching TV.	. I am not watching TV.
he, she, it: He is watching TV.    .	. He is not watching TV.
we, you, they: We are watching TV.	.  We are not watching TV.

to be verb as an auxiliary verb in the Present and Perfect Tenses (been)

Present Perfect Tense	It has been cold for 3 days.
Past Perfect Tense	It had been cold for 3 days.
Future Perfect Tense	It will have been cold for 3 days.

to be verb as an auxiliary verb in the Future Tenses and Modals (be)

Simple Future	It will be cold tomorrow. It is going to be cold tomorrow.
can	He can be sick.
may	It may be hot.
would	She would be happy.
must / have to	They must be ready. The have to be ready.

be as an auxiliary verb in the passive structure:

Simple Present:	The room is cleaned.
Simple Past:	The room was cleaned.
will future:	The room will be cleaned.
going-to future:	The room is going to be cleaned.
Present - Past Perfect	It has been cleaned. It had been cleaned.

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This website has been written for teaching English Grammar and Vocabulary through interactive lessons and example sentences for showing and teaching how to use these grammar points and words in a sentence with the meaning in the authentic examples. You can practice English while learning English.
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