My opinion is that plays a role as indicates a greater impact on the role and the. Though i am a native english speaker, i am having trouble deciding between role and roles in the phrase below. They played a part in the.
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The american heritage dictionary of the english language gives four definitions of role, the first of which is also r le a character or part. If context matters, the entire sentence is: The roles of the two.
As might readily be supposed,.
If something or someone plays a part or plays a role in a situation, they are involved in it and have an effect on it. In this document from 1916, on the last line of the first page is the word r le.