Даже если тыква сладкая, моя сестра всё равно больше любит черешню.

Даже если means even if.

It introduces a condition that does not change the result:

• Даже если тыква сладкая... = Even if the pumpkin is sweet...

So the sentence says that the sweetness of the pumpkin does not affect the sister’s preference.

Because тыква is a feminine noun in Russian.

Adjectives must agree with the noun they describe in:

• gender
• number
• case

So:

• masculine: сладкий
• feminine: сладкая
• neuter: сладкое
• plural: сладкие

Since тыква is feminine singular, the correct form is сладкая.

In the present tense, Russian usually leaves out the verb to be.

So:

• Тыква сладкая literally looks like Pumpkin sweet
• but it means The pumpkin is sweet

This is completely normal in Russian.
If you wanted a past or future tense, a form of to be would appear:

• Тыква была сладкая = The pumpkin was sweet
• Тыква будет сладкая = The pumpkin will be sweet

Here всё равно means something like:

• all the same
• still
• anyway
• nevertheless

So:

• моя сестра всё равно больше любит черешню = my sister still likes cherries more / likes cherries more anyway

It shows that the first part of the sentence does not change the final outcome.

Because черешня is in the accusative case.

The verb любить takes a direct object, and direct objects are usually in the accusative:

• любить что? = to love/like what?

Dictionary form:

• черешня

Accusative singular:

• черешню

So:

• моя сестра любит черешню = my sister likes sweet cherries

This is a very common pattern:

• я люблю музыку
• он любит кошку
• мы любим зиму

Not exactly.

In Russian:

• черешня usually means sweet cherry
• вишня usually means sour cherry or the more tart kind often used in cooking

So черешню here is not just any cherry in the broadest possible sense; it usually suggests the sweet kind.

Больше любит means likes more or prefers.

Here больше is the comparative form of много / more, and with любить it expresses stronger preference:

• любит = likes
• больше любит = likes more

So the idea is not just that she likes cherries, but that she likes them more than the pumpkin being discussed.

A natural English translation is:

• Even if the pumpkin is sweet, my sister still prefers sweet cherries.

Yes, Russian word order is flexible, and several versions are possible.

For example:

• моя сестра всё равно больше любит черешню
• моя сестра всё равно любит больше черешню

But the given word order is the most natural here. It keeps больше любит together, which clearly expresses prefers / likes more.

Russian word order often changes:

• emphasis
• rhythm
• style

So the sentence order is natural, but not the only grammatically possible one.

Because даже если тыква сладкая is a subordinate clause.

Russian uses a comma before the main clause in sentences like:

• Если будет дождь, мы останемся дома.
• Хотя он устал, он продолжал работать.
• Даже если тыква сладкая, моя сестра всё равно больше любит черешню.

So the comma separates:

• the if-clause
• from the main statement

Моя сестра is in the nominative case, because it is the subject of the sentence.

Breakdown:

• моя = my in feminine nominative singular
• сестра = sister in nominative singular

The subject is the person doing the liking:

• моя сестра любит... = my sister likes...

Because the sentence talks about a general preference, not a single completed action.

Russian aspect works like this:

• imperfective = ongoing, habitual, repeated, general
• perfective = completed, one whole action

Любить is imperfective and is the normal verb for:

• liking
• loving
• having a standing preference

So:

• она любит черешню = she likes cherries
• not she liked cherries once and finished doing so

That is why любит is exactly the right choice here.

Yes, that is the most natural interpretation.

Because the sentence first mentions sweet pumpkin and then says:

• моя сестра всё равно больше любит черешню

This strongly suggests:

• Even if the pumpkin is sweet, she still prefers cherries to pumpkin.

Without a second comparison item stated explicitly, Russian often lets the context supply it. Here the comparison is understood from the first clause.