В магазине мы купили кокос и два манго.

В магазине means in the shop/store and uses the prepositional case.

After в, Russian can use different cases depending on meaning:

• в магазине = in the store (location, no movement) → prepositional
• в магазин = into the store (motion toward) → accusative

So here it is в магазине because the sentence tells us where the buying happened, not where someone went.

Купили is the past tense plural form of купить.

Why plural? Because the subject is мы = we.

In the past tense, Russian verbs agree with the subject in gender/number:

• я купил = I bought (male speaker)
• я купила = I bought (female speaker)
• мы купили = we bought
• он купил = he bought
• она купила = she bought
• они купили = they bought

So мы купили is the normal way to say we bought.

Купить is the perfective verb, and купили presents the action as completed: they bought the items.

In this sentence, the focus is on the finished result: the shopping happened, and the items were bought.

Compare:

• мы купили кокос и два манго = we bought a coconut and two mangoes
• мы покупали кокос и два манго = we were buying / used to buy a coconut and two mangoes / bought them in a process-oriented sense

A simple one-time completed purchase usually uses купить.

Because кокос is the direct object of the verb купили, so it is in the accusative case.

For inanimate masculine singular nouns, the accusative looks the same as the nominative:

• nominative: кокос
• accusative: кокос

So:

• Мы купили кокос.

If it were an animate masculine noun, the accusative would usually look like the genitive instead.

Great question. Normally, after два / три / четыре, a noun takes a form traditionally described as genitive singular:

• два стола
• три дома
• четыре банана

But манго is an indeclinable noun in standard Russian. That means its form usually does not change across cases and numbers.

So:

• одно манго
• два манго
• пять манго

The numeral changes, but манго stays манго.

Usually from the context, especially from the number word or the verb.

In два манго, the numeral два clearly shows that there are two.

This is normal with indeclinable nouns in Russian. The noun itself may stay the same, while other words around it show the grammatical meaning.

Russian has no articles like English a/an and the.

So кокос can mean:

• a coconut
• the coconut

And манго can mean:

• a mango
• the mango
• mangoes, depending on context

Russian relies on context, word order, and the situation to show whether something is definite or indefinite.

Yes, often it could:

• В магазине купили кокос и два манго.

But there is an important detail: in the Russian past tense, the verb купили shows plural, but it does not show person clearly the way present-tense forms do. So купили could mean something like we bought or they bought, depending on context.

Because of that, мы is useful when you want to make the subject explicit.

So:

• Мы купили... = definitely we bought...
• Купили... = subject may be understood from context

Russian word order is relatively flexible. Starting with В магазине puts the location first:

• В магазине мы купили кокос и два манго.

This sounds natural and can give a slight sense of setting the scene: At the store, we bought...

You could also say:

• Мы купили кокос и два манго в магазине.

That version is also grammatical, but it places the location later. The difference is mostly about emphasis and information flow, not basic meaning.

One и is enough here:

• кокос и два манго

This simply joins the two things bought.

Russian does not need to repeat и unless you want a different style or structure. The sentence works just like English a coconut and two mangoes.

Here два is in the accusative, because the whole phrase два манго is a direct object after купили.

For the numeral два, the accusative often looks the same as the nominative when talking about inanimate things:

• nominative: два
• accusative: два

So the form does not visibly change here, but grammatically the phrase functions as the object of the verb.

Only if the meaning changes.

• кокос = one coconut
• кокосы = coconuts

So:

• Мы купили кокос и два манго = we bought one coconut and two mangoes
• Мы купили кокосы и два манго = we bought coconuts and two mangoes

The original sentence uses singular кокос, so it refers to one coconut.