"We praise our parents."

Translation: Noi îi lăudăm pe părinții noștri.

[Jake_78343]

Where does îi come from? I thought this was third person plural, which could be either le, i-, or le-.

[Antonio180048]

It is third person plural but accusative.
Accusative: them = îi (male) , le (female)
Dative: them = le, lor.

[Rosie-L]

I'm confused. Sometimes, following 'pe', the definite article seems to be required and sometimes it doesn't. Does this have something to do with the presence or not of a modifier - in this case 'nostri'?

[potestasity]

That's correct, the pronominal adjective "noștri" makes it necessary to have an article. You can drop the enclitic article and use the possessive one instead: "noi îi lăudăm pe ai noștri părinți", though it sounds less natural.

[Rosie-L]

Okay, thanks :-)