Breakdown of Стратегія допомогла переможцю.
Questions & Answers about Стратегія допомогла переможцю.
Because it is the subject of the sentence, so it is in the nominative singular.
- стратегія = strategy
- nominative singular = the basic dictionary form here
It is a feminine noun, which is also important because the past-tense verb agrees with it.
In the past tense, Ukrainian verbs agree with the subject in gender and number.
Since стратегія is feminine singular, the verb must also be feminine singular:
- допоміг = helped, masculine
- допомогла = helped, feminine
- допомогло = helped, neuter
- допомогли = helped, plural
So Стратегія допомогла... is grammatically matching стратегія.