Такси уже подъехало к подъезду, можешь спускаться.

Because такси is an indeclinable noun in Russian, and it is treated as neuter singular.

So in the past tense, the verb agrees with it:

• такси подъехало = the taxi arrived/pulled up

Compare:

• автобус подъехал — the bus pulled up
• машина подъехала — the car pulled up
• такси подъехало — the taxi pulled up

Even though такси refers to a vehicle with a driver, grammatically it is still neuter.

Подъехать means to drive up to, to pull up to, or to arrive by vehicle near something.

It is different from the more general приехать:

• приехать = to arrive (by transport), in general
• подъехать = to come up close to a specific place

So:

• Такси уже подъехало к подъезду suggests the taxi has not just “arrived in the area,” but has come right up to the entrance.

The preposition к means to / toward, and it requires the dative case.

The noun is:

• подъезд = entranceway / building entrance

In the dative singular:

• подъезд → к подъезду

So:

• к подъезду = to the entrance

This is a very common pattern:

• к дому — to the house
• к окну — to the window
• к станции — to the station

In everyday Russian, подъезд often means the entrance to an apartment building, especially the doorway and stairwell area used by residents.

So in this sentence, к подъезду is more specific than just “to the door.” It usually means the taxi has pulled up to the entrance of the building.

This is a very common Russian word in city/apartment-life contexts.

Уже means already.

It tells you that the action has happened by now:

• Такси уже подъехало = The taxi has already pulled up

In context, it signals urgency or readiness:

• the taxi is here now
• so you can go downstairs

It often appears in sentences where one action is now possible because another has already happened.

In Russian, subject pronouns are often omitted when they are clear from the verb form.

• можешь already means you can (singular, informal)

So:

• можешь спускаться = you can go down now

Adding ты is possible:

• ты можешь спускаться

But it is usually unnecessary unless you want emphasis, contrast, or extra clarity.

Both are possible in some contexts, but they are slightly different.

• спускаться is imperfective
• спуститься is perfective

Here, можешь спускаться sounds very natural because it means something like:

• you can start heading downstairs now
• you can be on your way down now

It focuses on the process beginning.

By contrast:

• можешь спуститься sounds more like you can go down / come down as a single complete action

In real speech, after news like The taxi is here, Russians often use the imperfective to mean you can start doing that now.

Because the sentence assumes the person is upstairs, probably in an apartment building.

Russian often describes this movement specifically:

• спускаться = to go down / come downstairs

Since the taxi is waiting downstairs by the entrance, this verb is more natural than a general verb like “leave.”

It reflects the physical layout:

1. you are in the apartment
2. you go down the stairs or elevator
3. you come out to the taxi

Literally, можешь means you can.

In context, though, English might translate it as:

• you can head down
• you may go down
• you can come down now

It is not really asking about physical ability. It is giving permission or saying that the right moment has arrived.

So the idea is:

• The taxi is here, so you can go down now.

The comma separates two clauses:

• Такси уже подъехало к подъезду
• можешь спускаться

These are two related statements:

1. the taxi has arrived at the entrance
2. as a result, you can go downstairs

Russian punctuation often separates clauses with a comma even where English might also use so or split them into two sentences:

• The taxi has already pulled up to the entrance, you can head downstairs.

Yes. It is informal because of можешь, which is the ты form.

If speaking politely or formally to one person, you would say:

• Такси уже подъехало к подъезду, можете спускаться.

If speaking to several people, можете would also be used.

So:

• можешь = informal singular
• можете = formal singular or plural

It is understandable, but подъехало is better here.

Why?

• приехало = arrived
• подъехало = pulled up / drove up close to

Since the sentence mentions к подъезду, Russian strongly prefers подъехало because it emphasizes coming right up to the building entrance.

So подъехало sounds more natural and precise in this situation.