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GRAMMAR & STRUCTURE — Examples
Compound Sentences

 
 

Characteristics of compound sentences

The students walk to the beach.
The students go for a swim.

These are two simple sentences.

The students walk to the beach, and they go for a swim.

This is one compound sentence.
It has two subjects: students / they.
It has two verbs: walked / went.

The students walked to the beach, and they went for a swim.

The simple sentences are joined by a comma and a conjunction: , and
It is not always necessary to use a comma before a linking word. If the sentence is short, you may omit the comma.

The teachers talk and the students listen.

The verbs agree in tense. Both verbs are in the present simple tense.
The comma (,) may be omitted before "and" if the sentences are short.

The teachers are talking, and the students are listening.

The verbs agree in tense. Both verbs are in the present simple tense.

Last year the students learned about sentences, but this year the students are learning about paragraphs.

The verbs are in different tenses because the sentence shows different times: "last year" is past tense; "this year" is present tense.

The students walk to the beach and go for a swim.

You can omit the second subject when the two subjects are the same.
In this sentence, the second subject has been omitted: and --- go. It is understood that "the students" is the subject of "walk" and of "go".
It is not possible to omit the second subject in this sentence -- "The teachers talk and the students listen." -- because the subjects are different.