Particles · N5–N4
と: and, with, and quotation
One particle with several related but distinct jobs.
In short
と can join a complete list of nouns, mark the person you do something with, or mark quoted/thought content before verbs such as 言う and 思う.
How it works
パンと卵 means “bread and eggs”; 友達と行きます means “go with a friend”; 行くと思います means “I think (someone) will go”.
Useful contrast
The quotation use attaches to the quoted clause, not to a noun list.
Examples
母と話します。
I talk with my mother.
明日行くと思います。
I think I will go tomorrow.
Common pitfall
When listing examples rather than a complete set, や is often more appropriate than と.