اختي كمان بتركب المترو، بس هي نزلت محطة قبلي امبارح.

Yes—if you write it more fully, it is أختي. In informal Egyptian writing, people often leave out the hamza, so اختي and أختي are both understood as my sister.

Also, the ending -ي means my, so:

• أخت = sister
• أختي / اختي = my sister

كمان means also, too, or as well.

So اختي كمان means my sister too or my sister also.

In Egyptian Arabic, كمان is very common in speech and can move around a little depending on emphasis, but this position is very natural.

In Egyptian Arabic, بـ on the verb usually marks the normal present tense, especially for habits or regular actions.

So:

• بتركب = she rides / she takes
• تركب without بـ is not the default simple present form here

In this sentence, بتركب المترو means she takes the metro as a usual thing.

In this context, ركب with transportation usually means to ride, to take, or to use that transport.

So بتركب المترو is most naturally:

• she takes the metro
• she rides the metro

It does not specifically focus on the moment of boarding. It is more about using that means of transport.

Here, بس means but.

That is a very common Egyptian usage:

• ..., بس ... = ..., but ...

Be aware that بس can also mean only or enough, depending on context. But in this sentence, after the comma and before a contrasting clause, it clearly means but.

It is not strictly necessary, but it is very natural.

بس هي نزلت... gives a slight contrast, like:

• but she got off...

It helps highlight she specifically. Arabic often repeats the subject pronoun like this for clarity, rhythm, or emphasis.

You could hear:

• بس هي نزلت محطة قبلي امبارح
• بس نزلت محطة قبلي امبارح

Both can work, but the version with هي sounds clearer and more contrastive.

Because in Egyptian Arabic, the past tense form نزلت can match more than one subject depending on context.

For example:

• أنا نزلت = I got off
• هي نزلت = she got off

So the verb form alone is ambiguous, but the sentence tells you the subject:

• اختي
• هي

Both make it clear that نزلت here means she got off.

This is a very colloquial Egyptian way to say that someone got off at a stop/station.

So:

• نزلت محطة قبلي = she got off a station before me
• more natural English: she got off one stop before I did

In everyday Egyptian, expressions with transport stops often get shortened, and a preposition like في may be omitted.

So even though a learner may expect something more literally like got off at a station, the shorter colloquial structure is very common.

قبلي comes from:

• قبل = before
• -ي = me

So قبلي literally means before me.

But in this sentence, it does not mean physically standing in front of me. It means:

• before I did
• before my stop
• earlier than me in the journey

So نزلت محطة قبلي means she got off one station before I got off.

Because the station is not being identified as a specific known one. It is indefinite here.

So محطة means:

• a station
• in this context, effectively one station / one stop

That is why the English translation is often one stop before me even though Arabic just says محطة.

If you were talking about a specific known station, you might expect a more definite expression.

Yes. امبارح means yesterday, and مبارح is also a common spelling in Egyptian Arabic.

Both are widely used in informal writing.

This is dialectal Egyptian. In Modern Standard Arabic, you would more likely see something like أمس or البارحة.

Putting time expressions at the end is very natural in Egyptian Arabic.

So:

• هي نزلت محطة قبلي امبارح

sounds completely normal.

Here, امبارح mainly goes with the second clause, the past event:

• but she got off a stop before me yesterday

It does not naturally describe بتركب المترو as a habit. That first clause is general, while امبارح refers to the specific past event.

Because the two clauses are talking about two different kinds of information:

• اختي كمان بتركب المترو = a general habit or regular fact
• بس هي نزلت محطة قبلي امبارح = a specific event that happened yesterday

So the tense shift is exactly what you would expect:

• My sister also takes the metro, but she got off one stop before me yesterday.

That mix of habitual present + specific past is very natural.