The particle と: with someone, and listing nouns

と joins nouns exhaustively — A and B and nothing else — and marks the person you do something together with.

Also known asto particleと particleand in japanesewith someone

N と Vと — together with (a person)

と particle

と after a person means “(together) with”: 友達と = “with a friend”.

友達と　日本へ　来ました。

ともだちと　にほんへ　きました。

I came to Japan with a friend.

と links a companion to the action. To say “alone”, use 一人で.

いつ = “when?”: いつ日本へ来ましたか — note いつ never takes に.

In the textbooksMinna I, lesson 5

N1 と N2と — and (listing nouns)Genki

と particle

と between nouns means “and”, listing them exhaustively: A と B = “A and B”.

日本語と　英語を　話します。

にほんごと　えいごを　はなします。

I speak Japanese and English.

京都と　大阪へ　行きました。

きょうとと　おおさかへ　いきました。

I went to Kyoto and Osaka.

This と joins two (or more) nouns into a complete list, “A and B”. For an open-ended list (“… and so on”) use や instead. Don't confuse it with the other と that marks a companion (“together with”).

The same particle と also means “together with (a person)” — see that card.

In the textbooksGenki I, lesson 4