Эта открытка оставила тёплое впечатление о нашем отпуске.

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Breakdown of Эта открытка оставила тёплое впечатление о нашем отпуске.

• отпуск: the vacation
• о: of
• наш: our

Questions & Answers about Эта открытка оставила тёплое впечатление о нашем отпуске.

Why is the verb оставила in the feminine form? I thought verbs don’t have gender.

In Russian, verbs in the past tense agree in gender and number with the subject.

• Эта открытка – открытка is a feminine noun (ends in -а).
• In the past tense, the verb оставить becomes:
  • оставил – masculine (он)
  • оставила – feminine (она)
  • оставило – neuter (оно)
  • оставили – plural (они)

Since открытка is feminine singular, the verb must be оставила.

If the subject were masculine, it would change:

• Этот отдых оставил тёплое впечатление… – This vacation left a warm impression…

Is тёплое впечатление in the nominative or accusative case? It looks like nominative to me.

Grammatically, тёплое впечатление is in the accusative singular, because it is the direct object of the verb оставила.

However, in Russian:

• For inanimate neuter nouns, nominative and accusative forms are identical:
  • Nominative: тёплое впечатление
  • Accusative: тёплое впечатление

So it looks like nominative, but its function in the sentence is accusative (the thing that was “left”).