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The reason is that the ending of the conjugated verb "tells" the subject.
o - yo
s - tú
vowel (a, e) = él, ella, Usted
-mos = nosotros/nosotras
-is = vosotros/vosotras
-n = ellos, ellas, ustedes
Above are the ending signals just for the Present Tense, as an example.
Sra