When

als

(at which, on which, during which)

wann

(at what time, as a direct question)

wann

(at what time, as an indirect question)

wenn

(at which, on which, during which)

wo

(at which, on which, during which)

als

(during the time that)

als

(at what time; at which time)

sobald

(as soon as, at the time that)

wenn

(as soon as, at the time that)

wenn

(during the time that)

wenn

(at what time; at which time)

Wann

(the time)

wann

(what time; which time)