Learn Hardcore Czech: Kdybych měl více peněz, koupil bych si větší byt v centru. - If I had more money, I would buy myself a bigger apartment in the center.

kdy = when (in questions):
- Kdy přijdeš? – When are you coming?
když = when / if (for real, factual conditions):
- Když mám čas, čtu. – When/If I have time, I read.
kdybych = if I (were / had / did) in an unreal, hypothetical, or contrary‑to‑fact situation:
- Kdybych měl více peněz… – If I had more money… (but I don’t).

So kdybych clearly signals that the condition is not real (at least at the moment), similar to English if I were / if I had in a hypothetical sense.

Why is měl (a past form) used in kdybych měl více peněz instead of a present or future form?

In Czech, unreal/hypothetical conditions are usually formed with:

kdyby + past tense (conditional meaning, not real past time)

So:

Kdybych měl více peněz… – literally If I had more money…
This is a standard way to say a hypothetical “if” about the present or future, not about the past.

Using a future form like budu mít here would change the meaning:

Když budu mít více peněz, koupím si větší byt.
– When/If I have more money (in the future, realistically), I’ll buy a bigger flat.

So:

kdybych měl = hypothetical, not sure or even contrary to reality
když budu mít = realistic future condition

What form is více peněz, and why is it peněz and not peníze?

Více peněz is literally more of money, and Czech uses the genitive plural after více:

více + genitive plural → více peněz

Peníze is the nominative/accusative plural (the basic form), while peněz is the genitive plural.

Compare:

Mám peníze. – I have money. (nominative/accusative plural)
Mám více peněz. – I have more money. (genitive plural after více)

Other examples:

více knih – more (of) books
více lidí – more (of) people

So the pattern is:

více + [noun in genitive plural]

What is the difference between více and víc?

Both mean more, and in this sentence you could say:

Kdybych měl více peněz…
Kdybych měl víc peněz…

They are interchangeable in meaning, but differ in style:

více – slightly more formal, careful, or written
víc – more colloquial, very common in everyday speech

Grammatically, both are fine here. Spoken Czech will more often use víc.

What exactly does koupil bych mean, and what is the role of bych?

Koupil bych is a conditional form meaning I would buy.

Breakdown:

koupil – past tense form of koupit (to buy), masculine singular
bych – conditional particle for 1st person singular

Together, koupil bych = I would buy (hypothetical).

The particle bych always marks the conditional in the first person singular. Other persons:

koupil bys – you would buy (sg.)
koupil by – he/she/it would buy
koupili bychom – we would buy
koupili byste – you would buy (pl./formal)

So bych is like the English would, but it is attached to the verb as a clitic.

Why is it koupil bych si and not just koupil bych? What does si do?

Si is a reflexive pronoun in the dative, and in this kind of sentence it often expresses that you are doing something for yourself / for your own benefit.

koupil bych byt – I would buy a flat (neutral)
koupil bych si byt – I would buy myself a flat / I would buy a flat for myself

In practice, Czech very often uses si in verbs of getting/obtaining something for oneself (buying, cooking, making, etc.):

Koupím si auto. – I’ll buy myself a car.
Uvařím si kávu. – I’ll make myself some coffee.

So koupil bych si větší byt sounds completely natural: I would buy myself a bigger flat.

Can the order of koupil bych si change, like bych koupil si or koupil si bych?

In standard Czech, bych (and similar particles: by, bys, bychom, byste) behaves as a clitic and normally comes right after the first stressed element of the clause, or after the verb when it’s simple.

The most natural options here are:

Kdybych měl více peněz, koupil bych si větší byt v centru.
Kdybych měl více peněz, koupil bych si větší byt v centru. (same order)

In the main clause, koupil bych si is fine.
Forms like bych koupil si or koupil si bych sound wrong or very unnatural in standard language.

General rule to remember for your level:

Learn and use patterns like koupil bych si, udělal bych to, šel bych tam.
Don’t move bych randomly; keep it close to the verb, usually verb + bych.

Why is it koupil bych (perfective koupit) and not something like kupoval bych (imperfective)?

Koupit is a perfective verb: it expresses a completed action (to buy = one-time, finished purchase).

In this sentence you are talking about one complete act of buying a flat:

Kdybych měl více peněz, koupil bych si…
– If I had more money, I would buy (once, accomplish the purchase)…

Using kupovat (imperfective) would change the meaning:

Kupoval bych si větší byt…
– I would be buying / I would buy repeatedly / I would be in the process of buying…

That sounds strange here, because you typically buy one flat, as a single action. So perfective koupit is the natural choice.

How does větší work here, and why this exact form?

Větší is the comparative form of the adjective velký (big → bigger).

Adjective pattern:

velký byt – a big flat
větší byt – a bigger flat

In větší byt, the adjective must agree with the noun in:

gender: byt = masculine inanimate
number: singular
case: accusative (because it is the direct object)

For masculine inanimate nouns in accusative singular, the ending is often the same as in nominative, so:

nominative: větší byt
accusative: větší byt

That’s why you see větší byt without any extra change to the ending.

Why is it byt and not something like bytu? What case is větší byt?

Větší byt is in the accusative singular, because it is the direct object of the verb koupit (to buy something).

Case logic:

Koupil bych co? – větší byt → accusative

For a masculine inanimate noun like byt:

nominative singular: byt
accusative singular: byt (same form)

So both subjects and objects can look the same in this gender, but the function in the sentence (subject vs. object) tells you the case.

Why is it v centru and not v center or something else? What case is centru?

V centru uses:

the preposition v = in
the noun centrum (neuter)
in the locative singular: centru

Many Czech prepositions require specific cases. V meaning in/inside normally takes the locative:

v domě – in the house
v obchodě – in the shop
v centru – in the center (of the city)

Declension of centrum:

nominative: centrum – the center
locative: v centru – in the center

V center doesn’t exist in Czech; the correct locative ending here is -u → centru.

Could you also say do centra or na centru instead of v centru? Would the meaning change?

v centru – in the center, inside that area (where it is located)
do centra – to the center, movement towards / into the center
na centru – is not natural here for city center

So for the flat’s location, you want v centru:

větší byt v centru – a bigger flat in the center (located there)

Do centra is used with verbs of movement:

Jdu do centra. – I’m going to the center.

Can I change the order of the two clauses, like in English: I would buy myself a bigger flat in the center if I had more money?

Yes. Both orders are possible in Czech:

Kdybych měl více peněz, koupil bych si větší byt v centru.
Koupil bych si větší byt v centru, kdybych měl více peněz.

The meaning is the same. The first version (condition first) is very common, but putting the main clause first is also completely natural, just like in English.

How would I say a realistic condition instead of a hypothetical one, using this sentence?

For a real / possible future condition, Czech prefers když + future, not kdyby + past.

Your sentence in a realistic version:

Když budu mít víc/ více peněz, koupím si větší byt v centru.
– When/If I have more money, I’ll buy myself a bigger flat in the center.

Comparison:

Kdybych měl více peněz, koupil bych si…
– hypothetical, not necessarily realistic now (like English If I had more money, I would buy…)
Když budu mít víc peněz, koupím si…
– realistic future plan (like English If/When I have more money, I’ll buy…)