Tener means to have. Like ser and estar, it's irregular:

Pronoun	Tener	English
yo	tengo	I have
tú	tienes	you have
él / ella / usted	tiene	he, she has / you (formal) have
nosotros / nosotras	tenemos	we have
vosotros / vosotras	tenéis	you (a group) have
ellos / ellas / ustedes	tienen	they have / you (formal, a group) have

Two patterns help: yo gets a g — tengo — and the stem changes to tien- in tienes, tiene, tienen. Nosotros and vosotros keep the plain ten-.