She sings slower than I (do).
Yeah, I'd rather it be, "She sings more slowly than I do."
Came here to see if this was mentioned.
This sentence can also mean
"She sings in a lower volume than me"
"वह मुझसे /धीमी आवाज़ में/ (धीरे) गाती है|"
Where do i infer the comparison? i.e., there's no "than" in the sentence
मुझ (mujh, “oblique of मैं”) + से (se, “instrumental particle; comparative particle”).
मुझसे is the comparison, it is also used as "than me"