と (and)
and (joining nouns)
Noun + と + Noun
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と joins nouns: 犬と猫, "dogs and cats". It gives a complete list, "A and B" and nothing else. For "A, B and so on", Japanese uses や instead.
と only joins nouns. It never links verbs, adjectives or whole sentences: for "I ate and slept", Japanese changes the verb's form instead (the て-form, later in this deck).
With more than two items, と goes between each: パンとたまごと牛乳, "bread, eggs and milk".
The same と after a person means "with" (友達と行きます, "I'm going with a friend"), a separate point further on.
Examples
パンとたまごを買いました。
I bought bread and eggs.
私と妹は学生です。
My little sister and I are students.
月曜日と木曜日は忙しいです。
I'm busy on Mondays and Thursdays.
東京と大阪に行きました。
I went to Tokyo and Osaka.
机の上に本とペンがあります。
There's a book and a pen on the desk.