Ser
To be (permanent)
Estar
To be (temporary or location)
Hacer
To do/make
Poder
To be able to
Decir
To say
Ir
To go
Ver
To see
Dar
To give
Saber
To know (a fact)
Llegar
To arrive
Deber
To owe/should/must
Poner
To put
Parecer
To seem
Creer
To believe
Llevar
To wear/carry
Dejar
To leave/allow/abandon
Seguir
To continue/follow
Encontrar
To find
Venir
To come
Pensar
To think
Salir
To go out
Volver
To return
Tomar
To take/have
Conocer
To know/meet