Mire hazaérek, a számítógép már ki lesz kapcsolva.

Here mire means by the time.

So Mire hazaérek means By the time I get home.

This is a very common Hungarian pattern:

• Mire + clause, something else has happened or will already be true by that point.

Also, mire can mean other things in other contexts, such as what for or onto what, so learners often find it confusing. In this sentence, though, it is clearly the conjunction by the time.

Because mire emphasizes a result that is already true at that later point.

Compare:

• Amikor hazaérek... = When I get home...
• Mire hazaérek... = By the time I get home...

In this sentence, the idea is not just that two things happen around the same time. The idea is that when I arrive, the computer will already be off. That is exactly the kind of meaning mire is good at expressing.

Because hazaér is treated as a single verb meaning to get home / arrive home.

It is made up of:

• haza = homeward / home
• ér = arrive, reach

When the verbal prefix-like element is in its normal position, Hungarian writes it together with the verb:

• hazaérek = I get home / I arrive home

But it can separate in other sentence patterns:

• Nem érek haza időben. = I won’t get home on time.
• Mikor érsz haza? = When do you get home?

So the one-word form is normal here.

Because Hungarian often uses the present tense form to talk about the future when the time reference is clear from context.

Here, the future meaning is clear because of the whole sentence:

• Mire hazaérek = By the time I get home
• ki lesz kapcsolva = will be switched off

So even though hazaérek is grammatically present, it refers to a future event.

This is very normal in Hungarian, especially in time clauses like:

• ha... = if...
• amikor... = when...
• mire... = by the time...

This is a very common Hungarian structure meaning something like will be switched off or will be in the switched-off state.

It contains:

• ki = the verbal particle, here giving the sense of off/out
• lesz = will be
• kapcsolva = a participle-like form from kapcsol = switch/connect

So literally it is something like:

• will be switched off
• or more literally, will be in an off-switched state

In natural English, will be switched off is usually the best translation.

Because in this kind of structure, Hungarian normally keeps the verbal particle separate:

• ki van kapcsolva
• ki lesz kapcsolva

This is similar to how particles often separate from the verb in Hungarian under certain conditions.

Compare:

• Kikapcsolom a gépet. = I switch off the computer.
• A gép ki van kapcsolva. = The computer is switched off.
• A gép ki lesz kapcsolva. = The computer will be switched off.

So the separated form is the normal one here.

It is passive-like, but it is better to think of it as a state/result expression.

Hungarian does not use the passive in the same central way English does. Instead, it often says that something is in a certain state:

• be van zárva = is closed
• ki van kapcsolva = is switched off
• ki lesz kapcsolva = will be switched off

This sentence focuses more on the resulting state of the computer than on who performs the action.

If you wanted to focus on the action or the person doing it, you might say something more active, such as:

• Mire hazaérek, valaki kikapcsolja a számítógépet.
• Mire hazaérek, ki fogják kapcsolni a számítógépet.

But the original sentence is very natural.

Because Hungarian normally uses the definite article when talking about a specific, identifiable thing.

So:

• a számítógép = the computer

This suggests a particular computer that both speaker and listener can identify from the situation or context.

Hungarian often uses articles in places where English does too, so this part is quite straightforward.

Már means already.

It tells you that at the moment the speaker gets home, the computer will already be off.

So it strengthens the timing relationship:

• not just it will be off
• but it will have been off by then / already be off by then

Without már, the sentence would still be possible:

• Mire hazaérek, a számítógép ki lesz kapcsolva.

But már makes the meaning more precise and natural.

Usually, Mire hazaérek is the more natural Hungarian.

Hungarian commonly uses the present tense in subordinate time clauses even when the meaning is future, so:

• Mire hazaérek is idiomatic and normal.

A form with fogok is much less natural here. Learners often want to use fog everywhere for the future, but Hungarian does not work that way. In clauses like this, the simple present is usually preferred.

Yes, Hungarian word order is flexible, but changes can affect emphasis.

The given sentence:

• Mire hazaérek, a számítógép már ki lesz kapcsolva.

is a neutral, natural way to say it.

You could also say:

• A számítógép már ki lesz kapcsolva, mire hazaérek.

That still means basically the same thing, but the focus is slightly different because the sentence starts with the computer rather than the time clause.

Hungarian word order often reflects focus, topic, and emphasis, not just grammar.

It mainly tells you the resulting state: the computer will be off by then.

Very often, that implies that someone will have switched it off, but the sentence does not say who. The agent is left unspecified.

So the meaning is closer to:

• By the time I get home, the computer will already be switched off / will already be off.

The important information is the state of the computer at that future moment, not the person who caused it.