Autobuzul trece pe lângă casă.

Because -ul is the Romanian definite article attached to the end of the noun.

• autobuz = bus
• autobuzul = the bus

Romanian usually puts the definite article at the end of the noun, unlike English, which uses a separate word the.

So:

• Autobuzul trece... = The bus passes...

Trece is the 3rd person singular present tense of the verb a trece.

Here are a few forms:

• eu trec = I pass
• tu treci = you pass
• el/ea trece = he/she/it passes

Since autobuzul is singular and functions like it, Romanian uses trece:

• Autobuzul trece = The bus passes / is passing

In this sentence, a trece means to pass or to go past.

This verb can have several related meanings depending on context, such as:

• to pass
• to cross
• to go by
• to move past

But in Autobuzul trece pe lângă casă, the natural meaning is:

• The bus passes by the house
• The bus goes past the house

So the combination with pe lângă helps fix the meaning.

Pe lângă is a very common Romanian expression meaning:

• by
• past
• alongside
• next to, depending on context

In this sentence, trece pe lângă is best understood as:

• passes by
• goes past

So:

• Autobuzul trece pe lângă casă = The bus passes by the house

A useful point: learners often try to translate pe and lângă separately, but here it is better to learn pe lângă as a unit.

Casă is the indefinite/basic form: house
Casa is the definite form: the house

So literally:

• pe lângă casă = by/past a house or sometimes just by the house, depending on context
• pe lângă casa = by the house — but usually this form needs something after it, like:
  • pe lângă casa mea = by my house
  • pe lângă casa vecinului = by the neighbor’s house

Romanian and English do not always use definiteness in exactly the same way. In many natural Romanian phrases, the noun may appear without the definite article even where English prefers the.

So pe lângă casă is perfectly normal Romanian.

Usually, no, not by itself.

That is because casa is often the form used before something else that identifies the house:

• casa mea = my house
• casa lui Andrei = Andrei’s house
• casa din colț = the house on the corner

If you want a fully definite standalone noun, Romanian often uses:

• casa in some contexts, yes, but after prepositions and in everyday phrasing, Romanian may still prefer casă in expressions like pe lângă casă

So for this sentence, pe lângă casă is the safest and most natural form to learn.

No, the word order is quite normal.

• Autobuzul = subject
• trece = verb
• pe lângă casă = prepositional phrase showing direction/location

So the structure is:

Subject + Verb + Prepositional phrase

That is very similar to English:

• The bus passes by the house

Romanian word order can be flexible, but this sentence uses a standard, neutral order.

The main thing to notice is the letter ă.

ă

This is a short central vowel, something like the a in sofa for many English speakers.

So:

• lângă sounds roughly like LUN-guh
• casă sounds roughly like KAH-suh

A few notes:

• â in lângă is a different vowel from ă
• â is a deeper central sound, often unfamiliar to English speakers
• gă is pronounced with a hard g, as in go

Very rough English-style approximations:

• lângă ≈ LUHN-guh
• casă ≈ KAH-suh

These are only approximations, but they help at the start.

Because Romanian does not need an auxiliary verb here.

English often says:

• The bus is passing by the house

Romanian can simply use the present tense:

• Autobuzul trece pe lângă casă

This can mean:

• The bus passes by the house
• The bus is passing by the house

The exact meaning depends on context. Romanian present tense often covers both the simple present and the present continuous idea.

Yes. Besides literal movement, pe lângă can also appear in other meanings, for example:

• next to / beside
• in addition to
• sometimes even compared with, depending on context

But in this sentence, because of trece (passes), the physical meaning is the obvious one:

• The bus passes by the house

So for this example, it is best to understand trece pe lângă as a common combination meaning to pass by.

The most natural translations are:

• The bus passes by the house.
• The bus goes past the house.
• The bus is passing by the house.

The best one depends on context, but The bus passes by the house is a good direct translation for learning purposes.