El autobús para ahí.

Here, para is not the preposition for. It is the verb parar in the he/she/it form of the present tense.

So:

• para as a preposition = for, in order to, towards
• para as a verb form = stops

In El autobús para ahí, el autobús is the subject, so para is understood as stops.

Both are possible.

• El autobús para ahí = the bus stops there
• El autobús se para ahí = the bus stops there / comes to a stop there

In real Spanish, especially in everyday speech, parar and pararse can both be used in this kind of situation. Se para can sound a bit more like comes to a stop, but the sentence you were given is grammatical and natural.

These three words all talk about place:

• aquí = here, near the speaker
• ahí = there, not here, often near the listener or at a place already indicated
• allí = over there, usually farther away

So ahí is often the middle-distance there.

In everyday speech, the boundaries are not always strict, but this is the basic idea.

Because ahí is an adverb of place, and Spanish usually does not need en before adverbs like aquí, ahí, or allí.

So you say:

• para ahí
• vive ahí
• ponlo ahí

But with a noun, you often do use a preposition:

• El autobús para en esa parada

So the difference is:

• ahí = adverb, no en needed
• esa parada = noun phrase, often with en

They show pronunciation.

In autobús, the accent tells you the stress is on the last syllable: au-to-BÚS.

In ahí, the accent on í shows that a and í are pronounced separately: a-Í. Without that written accent, Spanish spelling rules might suggest a different pronunciation.

Also, the h in ahí is silent.

It can be either. The Spanish present tense often covers both meanings, and context tells you which one is meant.

It can mean:

• a general fact or habit: The bus stops there
• something happening now: The bus is stopping there

If you wanted to make the future clearer, you could say El autobús va a parar ahí. But the simple present is very common for both general and immediate meaning.

Yes, para can sometimes be part of a phrase meaning towards there, for example:

• Voy para ahí = I’m heading there

But in El autobús para ahí, the grammar makes it clear that para is the verb parar, not the preposition para. Since el autobús is the subject, the natural reading is The bus stops there.

You can, but it changes the emphasis.

• Neutral order: El autobús para ahí
• Marked order: Ahí para el autobús

The version with ahí first sounds more emphatic or contrastive, as if you are stressing the location. For normal, neutral speech, El autobús para ahí is the most natural order.

Yes. Bus is common and understandable, and many speakers use it in everyday conversation.

• El autobús para ahí = more standard
• El bus para ahí = more informal

In Spain, both are used, though autobús is the safer standard word for learners.

A simple guide is:

el ow-toh-BOOS PAH-rah ah-EE

A few key points:

• autobús is stressed on the last syllable
• ahí has two syllables: a-í
• the h is silent
• in natural Spanish speech, the sounds will be smoother than in English, especially the r in para and the b sound in autobús