when

At (or as soon as) that time that; at the (or any and every) time that; if.

Pavlov's dogs salivate when [i.e. at any and every time that] they hear a bell.

When [i.e. at any and every time that] he speaks to her, he is always polite.

During the time that; at the time of the action of the following clause or participle phrase.

They dream when [i.e. during the time that] they sleep.

I'm happiest when [during the time that, or at any time that] I’m working.

wenn, sobald, wenn

когда́kogdá, когда́kogdá

коли́kolý, коли́kolý

At what time; at which time.

I am here till Friday, when [i.e. at which time] I leave for Senegal.

I was just walking down the street, when [i.e. at which time] all of a sudden it started to rain.

wenn, als

когда́kogdá, в то вре́мя какv to vrémja kak

коли́kolý

Since; given the fact that; considering that.

I don't see the point of putting up Christmas decorations when I am the only person who is going to see them.

Whereas; although; at the same time as; in spite of the fact that.

You're picking at your scabs when you should be letting them heal.

He keeps changing things when the existing system works perfectly well.