Both tener (to have) and venir (to come) differ from regular -er and -ir verbs in several ways.

tener

venir

Singular

yo

ten + go

ven + go

t™

tien + es

vien + es

è / ella / usted

tien + e

vien + e

EXAMPLES:

Yo tengo un libro.
Ella viene a las dos.

Plural

nosotros / nosotras

ten + emos

ven + imos

vosotros / vosotras

ten + éis

ven + ís

ellos / ellas / ustedes

tien + en

vien + en

EXAMPLES:

Nosotros tenemos dos perros.
Ellos vienen mañana.

Attention:
Though the stem is regular for the first person yo, the conjugation is irregular, changing from o to go. Many of the most common verbs in Spanish have this irregular first person conjugation.

Attention:
The stem changes from ten- to tien- and ven- to vien- in many of the forms (tú, usted, él, ella, ellos, ustedes). These are called e to ie stem-changing verbs.