"Do you like to play the piano with a sister?"

Translation: Ти любиш грати на піаніно з сестрою?

[lawnmoen]

Why is 'Чи' omitted here?

[SergioRuido]

It is not ommited. This type of question is not common in colloquial speech. Questions with Чи belong to sort of "bookish" type (poetry, classical prose, formal document language (like surveys, polls). I advise not to report these.

[Zonia435615]

I like it with the 'чи'. It sounds better and it makes more sense.

[Skladanowski]

In spoken, can we omit 'ти'? Любиш грати на піаніно з сестрою?