The verb 'to be' in English is used as a main verb or an auxiliary verb. As a main verb, it means 'to exist.' As an auxiliary verb, it helps to show tense.
Verb 'to be' Meaning In English - English Reading Is Fun Now!
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free worksheets verb to be am is are. English grammar for kids, English grammar, Grammar for kids
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A brief history of the verb to be in English
A brief history of the verb to be in English
English is FUNtastic: The Verb «To Be» - rules and examples