it is true because they indicate the possessor of something but they occur independently, without qualifying any noun, they are called possessive pronouns. Examples in Spanish would be "mine" and "yours"; like in "mine is red" or "this is yours".
I speak Spanish originally and take the opportunity to help those who speak this language, sorry for my bad English
Verb:”pides” Direct object:”Ayuda” Indirect object:”tutor” Subject:”tu” (I’m not sure on the last one bc it doesn’t really says the exact word like you or sum like that but I guess.)
