Venir (venu)
To come (Dr. and Mrs.)
Devenir
To become
Revenir
To come back
Tenir (tenu)
To hold (regular in p.c, all conj same as venir but just with a T)
Maitenir
To maintain
Retenir
To keep
Ago
il y a + time
For (time frame)
Pendant + time (generally in pc)
Have/has been
Present tense verb + depuis + time
Just
Venir de + infinitive