Adverbs of time indicate when the action is being performed. Let's see a few examples:

ahora	now
anoche	last night
anteayer	the day before yesterday
antes	before
aún	even, yet
ayer	yesterday
después	after
entonces	then
hoy	today
jamás	never
luego	then, later
mañana	tomorrow
nunca	never
pronto	soon
pasado mañana	the day after tomorrow
siempre	always
tarde	late
temprano	early
todavía	still, yet

Examples of sentences:

Ellos nos dijeron que nos darían el dinero hoy.
They said they would give us the money today.

Nosotros fuimos a la iglesia ayer.
We went to church yesterday.

Íbamos a pintar el pasillo pasado mañana pero vamos a pintar la escalera primero.
We were going to paint the hall the day after tomorrow, but we will paint the stairway first.

[ full lesson ]