Coordinating conjunctions link equal parts of a sentence—like two nouns, two adjectives, two clauses—and make your speech and writing flow smoothly. They are super useful for joining ideas without repeating words.
For
Use for to give a reason or explanation, and it sounds a bit more formal than because. It connects an effect to its cause.
Examples
And
Use and to add one idea to another, whether you're joining things, actions, or descriptions. It shows that both things are true or happen.
Examples
Nor
Use nor to continue a negative idea after another negative, and it pairs well with neither. It shows that two or more things do not happen or are not true.
Examples
But
Use but to show contrast or an unexpected difference between two ideas. It signals that the second idea disagrees with or limits the first.
Examples
Or
Use or to present a choice, alternative, or possibility between two or more things. It can be used for real options or hypothetical ones.
Examples
Yet
Use yet to introduce a contrast that is surprising or to add information that qualifies what came before. It is similar to but but often sounds a bit stronger or more formal.
Examples
So
Use so to show a result or consequence of what was just said. It connects a cause to an effect and often signals that one thing happened because of another.
Examples
Summary
Coordinating conjunctions keep equal ideas connected and clear. Use and to add, but to contrast, or to choose, for to explain, nor to continue negatives, yet to show surprising contrast, and so to show result.
Suggested Reading

English File by Unknown (Oxford University Press series)

Practical English Usage by Michael Swan

English Grammar in Use by Raymond Murphy

English Grammar Workbook: Simple Grammar for Non-Native Speakers by SIMPLE English Language School

Essential Grammar in Use by Raymond Murphy

New Concept English by L. G. Alexander

Oxford Practice Grammar by Norman Coe, Mark Harrison & Ken Paterson

The Blue Book of Grammar and Punctuation by Jane Straus
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