Если хочешь, я зайду в булочную после работы и куплю по круассану к чаю.

In Russian, subject pronouns are often omitted when the verb ending already makes the subject clear.

• хочешь = you want / you would like
• so ты is optional

So Если хочешь simply means If you want or If you'd like. Adding ты is possible, but it is not necessary here and may sound slightly more explicit or contrastive.

Here it works as a natural conversational phrase meaning:

• If you want
• If you'd like
• If that works for you

It is not a heavy conditional in the English sense. It often introduces a friendly offer or suggestion.

So the speaker is basically saying: If you want, I can do this.

Both are first-person singular future forms:

• зайду = I will drop in / I will stop by
• куплю = I will buy

They are from perfective verbs, which is why they refer to a single completed future action.

That fits this sentence well, because the speaker means:

• one visit to the bakery
• one purchase

Russian commonly uses perfective future for this kind of concrete plan or offer.

Зайти means something like to drop in, to stop by, or to pop into a place, often briefly.

So:

• пойду в булочную = I’ll go to the bakery
• зайду в булочную = I’ll stop by the bakery

In this sentence, зайду sounds very natural because the speaker plans to go there on the way, probably briefly, after work.

Because this sentence expresses motion toward/into a place.

After в:

• accusative is used for motion into a place
• prepositional is used for location inside a place

So:

• зайду в булочную = I’ll go into / stop by the bakery
• я в булочной = I’m in the bakery

Here булочную is accusative singular because the speaker is going there.

Булочная means bakery or bread shop.

It comes from булка, a type of bread roll or loaf, and historically means a shop that sells baked goods. In modern use, it can often be understood simply as bakery.

Learners also notice that it looks like an adjective. That is because some Russian shop names are originally adjective forms used as nouns, for example:

• булочная = bakery
• столовая = cafeteria
• прачечная = laundry

So в булочную means to the bakery.

Because после requires the genitive case.

• работа = work
• genitive singular = работы

So:

• после работы = after work

This is a very common pattern in Russian:

• после урока = after the lesson
• после обеда = after lunch
• после фильма = after the film

По круассану means a croissant each.

This is a very important use of по in Russian: it can express distribution, meaning one item per person.

So if two people are being talked about, куплю по круассану means:

• I’ll buy one croissant for you
• and one croissant for me

Not just one croissant total.

Because after по in this distributive meaning, Russian often uses the dative singular when the meaning is one each.

• nominative: круассан
• dative singular: круассану

So:

• по круассану = one croissant each

Compare:

• по яблоку = an apple each
• по бутерброду = a sandwich each

This is a very common pattern.

Because the meanings are slightly different.

• два круассана = two croissants
• по круассану = one croissant each

The second version emphasizes distribution between people, not just the total number.

So куплю два круассана tells you the quantity. Куплю по круассану tells you how they are divided.

К чаю is a very common Russian expression meaning something like:

• for tea
• to go with tea
• to have with tea

It usually refers to food, especially something sweet or bakery-related, that you eat while drinking tea.

So круассан к чаю is not literally to the tea in English. It means a croissant to have with tea.

They are related but not identical.

• с чаем = with tea
• к чаю = for tea / to go with tea

К чаю is idiomatic when talking about buying or serving something as a tea-time snack.

For example:

• Что купить к чаю? = What should I buy for tea?
• печенье к чаю = cookies to have with tea

So in this sentence, к чаю is the most natural choice.

Because Если хочешь is a subordinate clause, and Russian normally separates such clauses with a comma.

Structure:

• Если хочешь, = if you want
• я зайду... и куплю... = main clause

Russian punctuation is quite strict about this, so the comma is required.

The word order is natural and neutral for spoken Russian.

• Если хочешь sets up the offer
• я зайду в булочную после работы gives the first action
• и куплю по круассану к чаю adds the second action

Russian word order is flexible, but this version sounds smooth and conversational. It presents the plan in the order it happens:

1. after work
2. stop by the bakery
3. buy croissants

So the sentence feels very natural as an everyday offer.