Same with any other verb (you have to conjugate it) in most languages (English is actually easy in this! In French it's Travailler: Je travaille, tu travailles, il/elle/ce travaille, nous travaillon, vous travaillez, ils/elles travaillet. So be glad!)
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Because that is how you conjugate the verb
To Work:
I work
You (singular) work
HE/she/it works
We work
You (plural) work
They work
Same with any other verb (you have to conjugate it) in most languages (English is actually easy in this! In French it's Travailler: Je travaille, tu travailles, il/elle/ce travaille, nous travaillon, vous travaillez, ils/elles travaillet. So be glad!)