often
Tornadoes are not often seen.
a menudo
No se ven tornados a menudo.
never
One should never give up.
nunca
Uno nunca debería rendirse.
first
Safety comes first.
primero
La seguridad es lo primero.
enough
She wants to sleep and has had enough of the noise.
suficiente
Ella quiere dormir y ha tenido suficiente del ruido.