Я положила пакеты в багажник, чтобы в салоне было свободнее.

Because the speaker is female.

In the past tense, Russian verbs agree with the gender and number of the subject:

• положил = a man put
• положила = a woman put
• положило = it put
• положили = they put

So Я положила means I put said by a woman.

Положить is the perfective verb, while класть is imperfective.

Here, the speaker is talking about a completed action: she put the bags into the trunk, and that action is finished. Russian normally uses the perfective in that situation:

• класть / положить = to put, to place
• Я положила пакеты... = I put the bags...

If the sentence were about a repeated action, a process, or a general habit, Russian would more likely use класть.

Пакеты is the accusative plural form of пакет.

Since пакет is an inanimate noun, its accusative plural is the same as its nominative plural:

• nominative plural: пакеты
• accusative plural: пакеты

It is accusative here because the bags are the direct object of положила.

Because Russian uses different cases depending on whether в means movement into something or location inside something.

• в багажник = into the trunk → motion/direction → accusative
• в салоне = in the passenger compartment / inside the car → location → prepositional

So:

• багажник → accusative singular: в багажник
• салон → prepositional singular: в салоне

This is a very common Russian pattern:

• идти в дом = go into the house
• быть в доме = be in the house

In this context, салон means the inside seating area of the car, not the trunk.

So the contrast is:

• багажник = trunk
• салон = interior/passenger compartment

A learner might first know салон from meanings like salon or shop, but with cars it commonly means the cabin/interior.

Here чтобы introduces a purpose clause. It means something like:

• so that
• in order that
• so

So the structure is:

• Я положила пакеты в багажник = I put the bags in the trunk
• чтобы в салоне было свободнее = so that there would be more room inside the car

This is one of the most common uses of чтобы in Russian.

Yes — that is a very common Russian pattern.

After чтобы, Russian often uses a past-tense form to express a desired result, especially in impersonal constructions:

• чтобы было лучше = so that it would be better
• чтобы было удобнее = so that it would be more convenient
• чтобы было свободнее = so that it would be more spacious / less cramped

So even though было is formally the past tense of быть, in this structure it does not simply mean literal past time. It expresses the intended result.

Because this is an impersonal construction.

There is no explicit subject like он, она, or машина. Russian often uses neuter singular past tense in sentences where English uses it in a general sense:

• было холодно = it was cold
• было трудно = it was difficult
• было свободнее = it was more spacious / there was more room

So было is neuter singular because the sentence is built without a real grammatical subject.

Grammatically, свободнее is the comparative of свободный.

Depending on context, it can mean:

• freer
• more available
• less busy
• more open
• more spacious / less cramped

Here, because the topic is moving bags from the passenger area to the trunk, it clearly means more spacious or less cramped.

So чтобы в салоне было свободнее means that the interior would have more room.

In this sentence, it behaves like the comparative form used in an impersonal predicate.

Russian comparatives such as лучше, хуже, удобнее, свободнее are often used in sentences with было / будет / стало:

• стало лучше = it became better
• будет удобнее = it will be more convenient
• было свободнее = it was / would be more spacious

For a learner, the most practical way to understand it is: this comparative form means more X, and in this sentence it describes the overall condition inside the car.

Yes. Russian word order is flexible, and different orders can change emphasis.

The given sentence is neutral and natural:

• Я положила пакеты в багажник, чтобы в салоне было свободнее.

But you could also say:

• Я положила в багажник пакеты, чтобы в салоне было свободнее.
• Чтобы в салоне было свободнее, я положила пакеты в багажник.

These versions are also grammatical. The basic meaning stays the same, but the focus shifts slightly.

Because Russian has no articles.

So:

• пакеты can mean the bags or some bags
• в багажник can mean into the trunk
• в салоне can mean in the interior / in the car

Russian relies on context instead of articles.

Yes.

• чтобы = so that / in order to
• для того чтобы = in order to, for the purpose of

So you could say:

• Я положила пакеты в багажник, для того чтобы в салоне было свободнее.

That is grammatical, but it sounds more formal and heavier. In everyday speech, чтобы is the more natural choice here.