Thread: знать

Originally Posted by George1992

It surprised me that you put an adverb behind "довольно" because In Czech it is possible to say "Я довольно знаю" in this very context.

«Довольно знаю» is possible in Russian too, but sounds a bit old-fashioned.«довольно знаю» in RusCorpora. Notice the years.

In modern language, the adverb довольно is used mostly with adjectives and other adverbs.

Originally Posted by George1992

I would also like to ask you about the sentence "Спроси у моей сестры". Is it necessary to say "у"?

You can say «спроси у моей сестры» («у» + genitive) or «спроси мою сестру» (accusative).

Originally Posted by Soft sign

You can say «спроси у моей сестры» («у» + genitive) or «спроси мою сестру» (accusative).

That transition can be tricky sometimes.

For example, you can say
"Попроси у моей сестры ручку" ("Ask my sister for a pen")
but you can't say
"Попроси мою сестру ручку". That should be "Попроси мою сестру дать тебе ручку" (Ask my sister to give you a pen")