Going with someone: と
Use と to say who joins you in an activity.
Coco-sensei
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After the name of a companion, と means “with”: けんさん と 行きます means “I’m going with Ken.” You already know と as a way to join nouns with “and.”
The surrounding sentence tells you which use is intended. パン と お茶 lists “bread and tea.” 友達 と 飲みます describes drinking “with a friend.” This use of と is for a companion, not a tool such as the pen in “write with a pen.”
To ask who is coming along, put 誰 before と: 誰 と 行きます か means “Who are you going with?” The question word stays in the companion’s position.
Examples
けんさん と 映画 を 見ます。
I’m watching a movie with Ken.
マリア と 学校 に 行きます。
I’m going to school with Maria.
誰 と 行きます か。
Who are you going with?
友達 と コーヒー を 飲みます。
I’m having coffee with a friend.