SPANISH VERB

darse cuenta

to notice, to realize

Conjugation

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Presente · now, habits and facts

Pretérito indefinido · finished actions

Pretérito imperfecto · “used to” and “was …ing”

Futuro · plans and promises; in speech, “voy a hablar” is just as common

Condicional · “would”

Presente de subjuntivo · wishes, doubts, “que …”

Imperfecto de subjuntivo · “if I were”, “si …”

Imperativo · requests and orders; a negative one uses the subjunctive (no hables)

One sentence for each tense, the way people say it.

Present

Ahora me doy cuenta de lo mucho que has cambiado.

Now I realize how much you've changed.
Past

Me di cuenta del error cuando ya había enviado el correo.

I noticed the mistake when I'd already sent the email.
Imperfect

Hablaba tan rápido que no se daba cuenta de nada.

He talked so fast he didn't notice anything.
Future

Tarde o temprano se dará cuenta de que tenías razón.

Sooner or later she'll realize you were right.
Conditional

Nadie se daría cuenta si cambiamos el cuadro de sitio.

Nobody would notice if we moved the picture.
Present subjunctive

Sal despacio, antes de que se den cuenta.

Leave slowly, before they notice.
Past subjunctive

Lo cambié sin que nadie se diera cuenta.

I changed it without anyone noticing.
Imperative

¡Date cuenta, Álvaro, de que ya no tienes veinte años!

Face it, Álvaro, you're not twenty any more!

"Darse cuenta de algo" is to realize or notice it; "notar" is more to feel or perceive.

The lessons that teach a form of it, and how they say it.

Advanced Level 1 · darse cuenta · se va a dar cuenta

The same pattern, on other verbs: irregular -ar verb.