か

お茶(ちゃ)を飲(の)みますか。

Ocha o nomimasu ka.

Would you like some tea?

Offering something to a guest

ペンか鉛筆(えんぴつ)を貸(か)してください。

Pen ka enpitsu o kashite kudasai.

Lend me a pen or a pencil, please.

か between two things means or

これ、食(た)べてもいいですか。

Kore, tabete mo ii desu ka.

May I eat this?

Asking permission in someone's home