He passed the ball to his teammate. When his teammate couldn't find a lace, he loaned him one.
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The plural form of the noun teammate is teammates.
The plural possessive form is teammates'.
example: My teammates' support is essential to my performance on the field.
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The possessive form for the singular noun teammate is teammate's.
Example: My teammate's injury turned out to be a minor one.
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Sin Cara is a wrestler with the WWE. Since Sin Cara wrestles
alone, and does not work with a teammate, it cannot be determined
if his teammate lost, since his teammate does not currently
exist.
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No, teammates is a noun. It's the plural form of teammate.