which

(interrogative)What one or ones (of those mentioned or implied).

Which is which?

By now, you must surely know which is which.

welcher, welche, welches

кото́рыйkotóryj

The/Any ones that; whichever.

Please take which you please.

In a non-restrictive relative clause, referring to something previously mentioned.

(relative)Referring to a preceding noun.

I dropped a saucepan, which knocked over the eggs, which went all over the kitchen floor.

I found my camera, which I thought I'd lost, under the bed.

(relative)Referring to a preceding statement.

The front door was open, which concerned me.

He had to leave, which was very difficult.

(proscribed, relative, иногда)In a restrictive relative clause, referring to a noun previously mentioned.

This is the letter which I received.

This is the letter in which he explains his decision.

Referring to a preceding noun.

(архаичное, relative)Used of people (now generally who, whom, that; which remains possible with words also referred to by it such as baby, child).

She had a young child, which cried incessantly.

der, welcher, was

кото́рыйkotóryj

котри́йkotrýj, яки́йjakýj