No. 3,368 in Russian
полезными
"Полезными" means "useful" or "beneficial" in English.
In a sentence
Фрукты полезными для здоровья.
Fruits are beneficial for health.
The word 'полезными' (useful/beneficial) is used as an instrumental plural adjective describing 'фрукты' (fruits) in terms of health benefits.
Этот совет оказался весьма полезными.
This advice turned out to be very useful.
The word 'полезными' is the instrumental plural form of 'useful,' indicating the role or function of the 'совет' (advice).
С таким инструментом задачи становятся более полезными.
With such a tool, tasks become more productive.
Here, 'полезными' describes the resultant state of tasks in the instrumental mood after applying the tool.
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