Do you remember what independent clauses are? They are groups of words with a subject and a verb, and they can stand alone as complete thoughts.
When we take two or more independent clauses and join them together, we form a compound sentence. We usually connect the clauses with a comma and a coordinating conjunction, but you can also join them with a semicolon.
The ducks quacked, and the chicks peeped.
The ducks quacked; the chicks peeped.
Did you notice how the sentences above express two main ideas?
The word compound means that something is made up of two or more elements, so it makes sense that these sentences expresses two or more main ideas.
Here is a sentence expressing three main ideas:
The ducks quacked, the chicks peeped, and the farmer smiled.
Notice that there are three independent clauses in that example.
The ducks quacked. The chicks peeped. The farmer smiled.
They could all stand alone if they wanted to, but they have decided to come together as one sentence.
Aw... isn't that sweet?
Compound Sentences & Coordinating Conjunctions
• They join things that are the same. (Like two or more independent clauses, two or more phrases, or two or more words.)
• There are seven of them. (for, and, nor, but, or, yet, so)