This is an irregular verb. It is a model verb.
Stem Change: e ie (tienes)
Present 1st Person: tengo
Imperative 2nd Person: ten
Preterite Stem: tuv-
Preterite Endings: e - iste - o - imos - isteis - ieron
Future Stem: tendr-
PresentPresente
Tienes un perro muy agradable.
You have a very friendly dog.
PreteritePretérito indefinido
Tuvimos mucho trabajo ayer.
We had a lot of work yesterday.
ImperativeImperativo afirmativo
Tengan paciencia, por favor.
Have patience, please.