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Conjunctions can be divided into two broad classes - coordinating and subordinating.
Coordinating conjunctions join pairs of clauses that are grammatically independent of each other.
Examples are: and, but, for, or, yet, so, nor, also, either--or, neither--nor etc.
- Birds fly and fish swim.
- I was annoyed still I kept quiet.
- Neither a borrower nor a lender be.
- There was little hope of success nevertheless they decided to perform the operation.
Words for repeated ideas can often be left out in the second of two coordinate clauses.
- She smokes and drinks. (= -- and she drinks.)
- She is clever but careless. (-- but she is careless.)