Notificamos el robo ayer.

Spanish often leaves out subject pronouns when the verb ending already shows who is doing the action.

Here, notificamos already means we notify / we notified, so nosotros is unnecessary. You could say Nosotros notificamos el robo ayer, but that usually adds emphasis or contrast, like we reported it, not someone else.

It can mean either, because the nosotros form of the present tense and the preterite is the same for many -ar verbs:

• notificamos = we notify
• notificamos = we notified

In this sentence, ayer makes it clear that it is past: we notified / reported yesterday.

Because ayer means yesterday, and that time expression normally goes with a completed past action.

So even though notificamos could theoretically be present or past, ayer removes the ambiguity. A native speaker will understand it as preterite: we notified/reported yesterday.

Because el robo is the direct object, and Spanish very often uses the definite article with nouns where English might or might not use the.

Here, el robo means the theft / the robbery being reported. It sounds natural and complete that way. Saying just Notificamos robo ayer would sound wrong or very unnatural in standard Spanish.

Robo usually means theft or robbery, depending on context.

In everyday Spanish, people often use robo quite broadly for something being stolen. In more precise legal language, Spanish can distinguish between robo and hurto, but for a learner it is enough to know that robo refers to stealing or a theft/robbery event.

Yes. In Notificamos el robo ayer, the thing being notified/reported is el robo, so that is the direct object.

That is why there is no preposition before it. Spanish uses the personal a mainly with specific people or animate beings, not with things like el robo.

Spanish word order is more flexible than English word order. Putting ayer at the end is completely natural.

These are all possible:

• Notificamos el robo ayer.
• Ayer notificamos el robo.
• El robo lo notificamos ayer.

They all mean roughly the same thing, but the focus changes slightly. Ending with ayer is a very normal neutral option.

Not necessarily. It only tells you when the reporting happened.

So Notificamos el robo ayer means that yesterday was the time when we reported/notified the theft. The theft itself could have happened yesterday, earlier, or at some other time.

It is grammatical, and it does mean to notify / to report formally, but in Spain other verbs may sound more natural depending on the situation.

For example:

• denunciar un robo = to report a theft to the police
• informar de un robo = to inform/report about a theft
• avisar = to inform/let someone know

So Notificamos el robo ayer is correct, but in a police-report context, Denunciamos el robo ayer may sound more idiomatic.

Normally, no. With notificar, the usual structure is:

• notificar algo
• notificar algo a alguien

So:

• Notificamos el robo
• Notificamos el robo a la policía

If you want a structure with de, a different verb is more natural:

• Informamos del robo ayer

It is stressed on the syllable ca:

no-ti-fi-CA-mos

That is because words ending in a vowel are normally stressed on the second-to-last syllable in Spanish. So the natural pronunciation is notificÁmos, not nótificamos or notificamós.