"I do not know his surname."

Translation: Eu não sei o sobrenome dele.

[Algarve2022]

pourquoi" eu não conheço o sobrenome dele est faux ???

[manosdefie]

could you have said "o seu sobrenome"? Or would you still have had to say "dele"?

[Paulenrique]

your opition is right too. just report.

[pinchbeck31]

What is the difference between conhecer and saber?

[djeidot]

You use "saber" about things you can learn, from books for example. "I know English/Eu sei Inglês" or "I know maths/Eu sei matemática" are some examples. You use "conhecer" about things you experienced, places you visited, or people you met.

For example, you can say: "Eu sei sobre Paris mas não conheço Paris". I know about Paris (because I read about it) but I don't know Paris (because I have never been there).

[JCMcGee]

Brilliant example...thank you

[Languagelover559]

"não conheço o sobrenome dele" Should also be accepted, no?

[Elisabetta53]

Please, what is more common to use: apelido or sobrenome?, thanks!

[Paulenrique]

Sobrenome = surname, last name. Apelido = nickname.

[AutumnAkin1]

Oh thats good to know. I wish they hadnt given the wrong hint of apelido for surname though.

[ChoYuDeok]

Perhaps because I know French, "Eu não sei o sobrenome dele" sounds wrong to me. I would say " Eu não sei qual é o seu sobrenome". Is the style of speech presented by Duo the standard? Does it sound natural to native speakers?

[Paulenrique]

Yes, "Eu não sei o sobrenome dele" is the most natural version.

[ChoYuDeok]

Thank you sigh I'll have to get used to it then

[lesliewilman]

I find it surprising that the article is necessary, when the possessive pronoun itself makes it definite.

[Paulenrique]

It's mandatory for dele, deles, dela and delas.

[lucavenezia61]

'Eu nao conheco o sobrenome dele' still gets e 'reject'. Shouldn't be fixed?

[AnaLuisa658845]

I got the sentence exactly correct snd you counted it wrong. I have a screenshot