Ми купили полуницю й малину.

In Ukrainian, names of fruit and berries are often used as mass nouns when you mean some amount of that food, especially after verbs like buy, eat, pick, and so on.

So:

• Ми купили полуницю й малину. = We bought strawberries and raspberries.
• Literally, it is more like We bought strawberry and raspberry produce.

This is very natural in Ukrainian. English usually prefers the plural here, but Ukrainian often prefers the singular.

The plural forms also exist:

• полуниці = strawberries
• малини = raspberries

But in a sentence about buying food in general, the singular is often the most natural choice.

Because they are in the accusative case. They are the direct objects of купили.

Dictionary forms:

• полуниця = strawberry / strawberries as a food
• малина = raspberry / raspberries as a food

Accusative singular forms:

• полуницю
• малину

This is a very common pattern for feminine nouns:

• nouns ending in -а usually change to -у in the accusative singular
• nouns ending in -я usually change to -ю in the accusative singular

So:

• полуниця → полуницю
• малина → малину

They are in the accusative case because they are the things that were bought.

In Ми купили полуницю й малину:

• Ми = the subject
• купили = the action
• полуницю й малину = what was bought

In Ukrainian, direct objects often take the accusative case, so this sentence follows a very basic and important pattern:

• subject + verb + accusative object

Купили is:

• past tense
• plural
• from the verb купити
• perfective aspect

So it means something like bought in the sense of a completed action.

Because the subject is ми = we, the verb is in the plural past form:

• я купив / купила = I bought
• ми купили = we bought

The aspect matters too:

• купити = to buy, as a completed action
• купувати = to buy / be buying, imperfective

So купили suggests that the buying was completed.

Yes, very often it can.

Ukrainian often drops subject pronouns when the verb already makes the subject clear. Since купили is plural past tense, it already suggests we or they, depending on context.

So both of these are possible:

• Ми купили полуницю й малину.
• Купили полуницю й малину.

Including ми can make the subject more explicit, or add emphasis, contrast, or clarity.

For example, ми may be included if you want to stress we, not someone else.

Both і and й can mean and. Ukrainian often chooses between them for euphony, meaning smooth, natural sound.

Here, й helps the sentence flow well:

• полуницю й малину

It avoids a less smooth sound sequence. This kind of alternation is very normal in Ukrainian.

So:

• і = and
• й = and

The meaning is the same, but the choice often depends on pronunciation and rhythm.

A rough pronunciation is:

My ku-PI-ly po-lu-NY-tsyu y ma-LY-nu

Stress:

• Ми
• купи́ли
• полуни́цю
• й
• мали́ну

A few helpful notes:

• и in Ukrainian is not exactly like English ee; it is shorter and more central.
• й sounds like English y in yes.
• цю at the end of полуницю is roughly like tsyu.

No, Ukrainian word order is more flexible than English word order.

The neutral, straightforward order here is:

• Ми купили полуницю й малину.

But other orders are possible, depending on emphasis:

• Полуницю й малину ми купили.
  This emphasizes what we bought.

Because Ukrainian uses case endings, word order does not carry as much grammatical information as it does in English. Still, not every order sounds equally natural in every context. The version in your sentence is the most neutral one.

Because Ukrainian has no articles like English a, an, or the.

So полуницю й малину can mean, depending on context:

• strawberries and raspberries
• some strawberries and raspberries
• the strawberries and raspberries

Context tells you which meaning is intended.

This is very normal in Ukrainian, and learners have to get used to relying more on context than on articles.

Here are the main forms:

• ми = we
• купити = to buy
• полуниця = strawberry / strawberries as a food
• й / і = and
• малина = raspberry / raspberries as a food

In the sentence, some of these appear in changed forms:

• купити → купили
• полуниця → полуницю
• малина → малину

That is very typical in Ukrainian: verbs and nouns change form to show grammar.