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A verb and a subject in a sentence

A verb in a sentence is a part of a predicate and a simple predicate consists only of a verb.
In a sentence: ‘She ate.’ ‘ate’ is a single verb word and a simple predicate.

‘She’ is an argument of a predicate and a simple subject of a sentence.

A simple predicate can be built by a simple verb or a string of verbs, when a verb phrase consists of auxiliary verbs and the main verb.

‘She iseating.’
‘She has beeneating.’
’She would haveeaten.’

In the sentences above the main verb is written in bold and auxiliary verbs are underlined. A combination of a main verb and auxiliary verbs is called a verb string.

Every verb in a sentence needs a subject of acting or doing.

She is eating.’

Who is eating? She is, so 'She' in the sentence above is a subject of a verb. Sometimes a sentence contains more than one verb describing action or doing by one subject:

She is eating and watching TV.
John went to the cinema and forgot to call the plumber.

We talk about a compound verb when…

Basics about how an English sentence is built

An English sentence consists of a subject, a verb, a completer and a modifier. A simple sentence can only have a verb, and a sentence is simple as long as it consists of one verb. A sentence in which we cannot find a verb or a subject and it cannot stand by itself is called a sentence fragment. When two or more independent sentences are joined without appropriate punctuation or conjunction then it is called a run-on sentence. A boy took a book from the library. ‘Boy’ is a subject here, ‘took’ is a verb, ‘book’ is a completer (object here), ‘from the library’ - a modifier. From linguistic point of view, a sentence consists of an argument and predicate; predicate contains a verb and adjuncts. So, in our sentence: ‘A boy took a book from the library.’ ‘Boy’ is an argument, and ‘took a book from the library’ is a predicate.