Ayer el portero dejó un aviso porque el pomo de la puerta estaba suelto.

Ayer simply means yesterday, and in Spanish it can be used on its own as a time expression at the start of a sentence:

Ayer el portero dejó un aviso... = Yesterday the porter/doorman left a notice...

Spanish often places time expressions first without any extra words. This is completely natural.

You could also say:

El portero dejó un aviso ayer.

Both are correct. Starting with Ayer just gives the time information first.

In Spanish, it is very common to use the definite article with professions or roles when talking about a specific person already identifiable in context.

So:

el portero = the porter / the doorman / the building caretaker

In English, we often drop the in some situations, but Spanish usually keeps it.

Compare:

• Vino el médico. = The doctor came.
• Llamó la vecina. = The neighbour called.

Here, el portero refers to a specific person, not just any porter.

In Spain, portero can mean more than just goalkeeper. In this sentence, it most likely means the building porter, doorman, or caretaker—someone connected with the maintenance or supervision of an apartment building.

Depending on context, English translations could include:

• doorman
• porter
• caretaker
• building manager (sometimes, loosely)

In this sentence, because there is a problem with the door, this building-related meaning makes the most sense.

Dejó is the preterite form of dejar, and it is used here because the action is seen as a completed event in the past:

Ayer el portero dejó un aviso...
= Yesterday the porter left a notice...

This is a single finished action.

If you said dejaba, that would usually suggest an ongoing, repeated, or background action, which does not fit as well here.

So:

• dejó = he left it, completed action
• dejaba = he was leaving / used to leave

This sentence contrasts nicely:

• dejó = completed event
• estaba suelto = background state

Because aviso is a masculine noun:

• un aviso
• el aviso

Even though aviso ends in -o, that already strongly suggests it is masculine, and in this case it is.

It usually means:

• notice
• message
• warning
• note

Here, dejar un aviso probably means to leave a note/message/notice.

Dejar un aviso literally means to leave a notice/message.

In natural English, depending on context, it could be:

• left a note
• left a message
• left a notice

It does not necessarily mean a formal official notice. It could simply be a written message informing someone about the problem.

So in context, the porter probably left some kind of note saying there was an issue with the door knob.

These are different forms:

• porque = because
• por qué = why

In your sentence, the meaning is causal:

...dejó un aviso porque el pomo de la puerta estaba suelto.
= ...left a notice because the door knob was loose.

So porque is the correct choice.

Quick comparison:

• Lo hizo porque quiso. = He did it because he wanted to.
• ¿Por qué lo hizo? = Why did he do it?

El pomo de la puerta means the doorknob / the knob of the door.

Spanish often uses de phrases where English prefers a compound noun:

• el pomo de la puerta = the door knob
• la manija de la puerta = the door handle
• la ventana de la cocina = the kitchen window

You could say just el pomo if the context is already obvious, but el pomo de la puerta is more explicit.

In Spain, pomo usually refers to a round door knob.

A manilla or manecilla can refer to a handle, especially one you press down rather than turn. In some regions, manija is also used, though usage varies across the Spanish-speaking world.

So:

• pomo = knob
• manilla/manija = handle

Your sentence specifically says pomo, so it suggests a knob rather than a lever-style handle.

Estaba is the imperfect of estar, and here it describes a state or condition in the past:

el pomo de la puerta estaba suelto
= the doorknob was loose

Spanish often uses the imperfect for background description, ongoing states, or circumstances.

So the structure is:

• dejó = main completed action
• estaba suelto = background reason/state

If you used estuvo suelto, it would sound more like the knob was loose for a completed period, which is less natural here. The sentence is simply describing the condition that explained why the note was left.

Because suelto agrees with el pomo, which is masculine singular.

Agreement in Spanish works like this:

• el pomo → masculine singular
• adjective must match → suelto

Examples:

• el pomo está suelto
• la puerta está suelta
• los pomos están sueltos
• las puertas están sueltas

So suelto is not agreeing with la puerta, but with el pomo.

Yes. Suelto can have different meanings depending on context, such as:

• loose
• free
• unattached
• not fixed
• single/individual in some expressions

But in this sentence, with el pomo de la puerta, the natural meaning is loose or not firmly attached.

So: el pomo estaba suelto = the doorknob was loose

Yes, Spanish word order is flexible.

The given version is very natural: Ayer el portero dejó un aviso porque el pomo de la puerta estaba suelto.

But you could also say:

• El portero dejó un aviso ayer porque el pomo de la puerta estaba suelto.
• Porque el pomo de la puerta estaba suelto, ayer el portero dejó un aviso.

The original order is probably the most neutral and natural:

1. time first: Ayer
2. subject: el portero
3. action: dejó un aviso
4. reason: porque...

Actually, Ayer has no accent mark. It is just Ayer.

The accented word here is dejó. The accent mark is important because it shows the stress pattern and distinguishes the past tense form.

• dejó = he/she left
• dejo = I leave (present tense)

Other words in the sentence do not need written accents:

• porque
• pomo
• puerta
• suelto

So the only written accent in the sentence is on dejó.

Yes. Even if the meaning is already clear, there are several natural English versions, depending on context:

• Yesterday the porter left a note because the doorknob was loose.
• Yesterday the doorman left a message because the door knob was loose.
• Yesterday the building caretaker left a notice because the door knob was loose.

The best translation depends on what portero means in the specific situation and how formal aviso is meant to sound.