В морозилке лежит контейнер с ягодами, которые мы заморозили летом.

Морозилке is in the prepositional case after в because this phrase expresses location: in the freezer.

• в + prepositional = where something is
• в + accusative = where something is going

So:

• в морозилке = in the freezer
• в морозилку = into the freezer

Also, морозилка is a very common everyday word for freezer.

Russian often uses position verbs where English simply says is or there is.

Here, лежит literally means is lying. In natural English, though, we usually translate it as there is / there’s / is sitting depending on context.

So:

• В морозилке лежит контейнер... = There is a container in the freezer...

Why лежит?

• Russian likes to describe an object’s position.
• For objects like containers, books, clothes, etc., лежать is very common if the object is understood as lying or simply being stored somewhere.

You could sometimes hear стоит instead if the container is upright, but лежит is perfectly natural here.

Because the grammatical subject is контейнер, which is singular.

• контейнер = one container
• so the verb is singular: лежит

The phrase с ягодами does not change the number of the verb. It only describes the container.

Compare:

• Лежит контейнер = A container is lying there
• Лежат контейнеры = Containers are lying there

After с meaning with, Russian normally uses the instrumental case.

So:

• ягоды = berries
• с ягодами = with berries

In this sentence, контейнер с ягодами means a container with berries or a container containing berries.

This is a very common pattern:

• чай с лимоном = tea with lemon
• сумка с книгами = a bag with books
• банка с вареньем = a jar with jam

Которые refers to ягодами — in other words, to the berries, not the container.

We can tell this because:

• контейнер is singular
• ягодами is plural
• которые is plural

So the relative clause means:

• berries, which we froze in summer

Not:

• container, which we froze in summer

This is a very useful grammar point.

Которые comes from который and works like which / that / who in a relative clause.

Its form depends on two things:

1. it must match the noun it refers to in number (and gender if singular)
2. its case depends on its role inside the relative clause

Here it refers to berries, which are plural, so we need a plural form.

Inside the clause которые мы заморозили летом, the berries are the direct object of заморозили (we froze [them]). So the pronoun is in the accusative plural.

For inanimate plural nouns, accusative plural looks the same as nominative plural, so we get которые.

That is why it is которые, not которых.

Because in Russian, subordinate clauses are separated by commas, including relative clauses with который.

So:

• контейнер с ягодами, которые мы заморозили летом

This is normal Russian punctuation.

A useful thing for English speakers to remember: Russian uses a comma here even where English might sometimes omit one, especially before that in a restrictive clause. Russian punctuation follows different rules.

Because заморозили is perfective, and it presents the action as completed.

• замораживать = imperfective, process/repeated action
• заморозить = perfective, complete the freezing

Here the meaning is that the berries were frozen successfully, as a completed action, at some point in the summer.

So:

• которые мы заморозили летом = which we froze in the summer

If you said замораживали, it would sound more like focusing on the process, repetition, or background action, not the completed result.

Yes, it could be omitted in some contexts, but мы is very natural here.

Important point: in the past tense, Russian verbs show gender/number, but not clearly person the way present tense verbs do.

• заморозили by itself means something like froze with a plural subject
• it does not by itself clearly say we, they, or sometimes even rely on context

So мы helps make the subject explicit:

• которые мы заморозили летом = which we froze in the summer

Without мы, the sentence might still be understandable from context, but with мы it is clearer and more natural.

Because Russian often uses the instrumental case by itself to express time periods like in summer, in winter, in the morning, etc.

So:

• лето = summer
• летом = in summer / during the summer

Other common examples:

• зимой = in winter
• утром = in the morning
• днём = during the day
• вечером = in the evening

So летом is a standard adverbial time expression.

Yes. Russian word order is flexible, and changing it usually changes focus or emphasis, not the core meaning.

For example:

• В морозилке лежит контейнер с ягодами, которые мы заморозили летом.

  • natural, starts with the location
  • roughly: In the freezer there is a container with berries...

• Контейнер с ягодами, которые мы заморозили летом, лежит в морозилке.

  • puts more focus on the container with berries

Russian often puts known/background information earlier and new/focused information later, but many orders are possible if they sound natural in context.

Almost. Both can mean freezer, but the tone is slightly different.

• морозилка = very common everyday word, a bit more informal/colloquial
• морозильник = more neutral or dictionary-like

In normal speech, в морозилке is extremely natural.

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

So контейнер can mean:

• a container
• the container

The exact meaning depends on context.

In this sentence, English could translate it as either:

• There is a container with berries in the freezer...
• The container with berries is in the freezer...

Russian leaves that to context instead of using articles.