Мы гуляли по тихой аллее в парке вечером.

Гуляли is the past tense plural form of гулять.

In this sentence, гулять means something like:

• to walk
• to stroll
• to take a walk
• to spend time walking around

It is not as goal-focused as verbs like идти (to be going, walking in one direction).
So Мы гуляли suggests we were out walking / we took a walk / we were strolling.

Because the subject is мы (we), the verb must be plural: гуляли.

The form гуляли is the past tense of гулять.

Russian past tense is formed from the infinitive stem plus endings that show gender/number:

• гулял = he walked
• гуляла = she walked
• гуляло = it walked
• гуляли = they / we walked

Since the subject is мы (we), Russian uses the plural past form гуляли.

Тихой аллее is in the dative case.

That is because of the preposition по, which often takes the dative when it means:

• along
• around
• through certain kinds of space

So:

• по аллее = along the alley/path
• по тихой аллее = along the quiet alley/path

The adjective and noun both change to dative singular feminine:

• тихая аллея = nominative
• тихой аллее = dative

Because after по in this meaning, Russian uses the dative, not the accusative.

Compare:

• тихая аллея = nominative
• тихую аллею = accusative
• тихой аллее = dative

So the correct phrase is:

• по тихой аллее = along the quiet alley

For an English speaker, this can feel strange because English does not show case so clearly. But in Russian, the preposition decides the case.

Because в парке expresses location: in the park.

Russian distinguishes between:

• в + accusative = motion into somewhere
• в + prepositional = being in somewhere

So:

• в парк = into the park
• в парке = in the park

In this sentence, the walking happens in the park, so Russian uses в парке.

Парке is in the prepositional case.

The dictionary form is:

• парк = park

After в meaning in, it becomes:

• в парке = in the park

This is a very common pattern:

• в доме = in the house
• в городе = in the city
• в саду / в саде = in the garden

Because Russian often uses the instrumental case by itself to express time when, especially with parts of the day or seasons.

So:

• утром = in the morning
• днём = in the daytime
• вечером = in the evening
• ночью = at night

Here, вечером means in the evening or that evening, without needing a word like in.

This is very natural in Russian.

Вечером is the instrumental case of вечер (evening).

The base form is:

• вечер

The instrumental form is:

• вечером

In this sentence, the instrumental is being used adverbially to mean in the evening.

Because it describes аллее, and аллея is a feminine noun.

Russian adjectives must agree with the noun they describe in:

• gender
• number
• case

Here:

• noun: аллее = feminine, singular, dative
• adjective: тихой = feminine, singular, dative

So the adjective changes to match the noun.

Not exactly.

Аллея usually means something like:

• tree-lined path
• walkway
• avenue in a park or garden
• alley/path for walking

It is often a pleasant pedestrian path, especially in a park.

It is not the normal word for a city street.
For street, Russian usually uses улица.

So тихая аллея в парке gives a more peaceful image than street.

Yes. Russian word order is more flexible than English because case endings show grammatical relationships.

The sentence:

• Мы гуляли по тихой аллее в парке вечером.

could be rearranged in several ways, for example:

• Вечером мы гуляли по тихой аллее в парке.
• Мы вечером гуляли по тихой аллее в парке.
• По тихой аллее в парке мы гуляли вечером.

These versions are all possible, but the emphasis changes slightly.

The original order sounds natural and neutral: We were walking along a quiet path in the park in the evening.

By itself, гуляли is imperfective, so it does not strongly present the action as a single completed whole.

It can mean different things depending on context, such as:

• we were walking
• we used to walk
• we spent time walking
• we took a walk

In this sentence alone, it most naturally suggests a past scene:
We were walking along a quiet path in the park in the evening.

If Russian wanted to emphasize a single completed outing more clearly, a different verb or more context might be used.

Russian has no articles.

So where English says:

• the quiet alley
• a quiet alley
• the park

Russian simply says:

• тихой аллее
• в парке

Whether it means a or the depends on context.

In this sentence, English might translate it as either:

• We were walking along a quiet path in the park in the evening.
• We were walking along the quiet path in the park in the evening.

Both are possible depending on the situation.

The main word stresses are:

• мы
• гуля́ли
• по
• ти́хой
• алле́е
• в
• па́рке
• ве́чером

So the sentence is pronounced approximately as:

Мы гуля́ли по ти́хой алле́е в па́рке ве́чером.

Stress is very important in Russian, because it is not always predictable and can affect pronunciation of vowels.