A sentence is a small, sealed vessel for holding meaning. It delivers some news – an assertion, command or question – about the world. Every sentence needs a subject, which is a noun or noun phrase, and a predicate, which is just the bit of the sentence that isn’t the subject and that must have a main verb. The subject is usually (but not always) what the sentence is about and the predicate is usually (but not always) what happens to the subject or what it is. This [subject] is a sentence [predicate]. A sentence must have a subject and a main verb, except when it leaves out one or both of them
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