Please reply me: when to use 'to be' and 'be' as main verb in a sentence?
"to be", with the infinitive marker "to" included, is not a finite verb so it cannot (by itself) be the "main verb" in a sentence.
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"to be", with the infinitive marker "to" included, is not a finite verb so it cannot (by itself) be the "main verb" in a sentence.