How is deded wawa erere soso kaka lolo popo

Why isn’t it wenn ich habe hunger but instead it is ween ich hunger habe

When you use construct a sentence in german in past tense for example i drank milk on monday in the caravan the last tense version ich getrinken milsch am montag in mine whonwagen how would you put this is the write order if the sentence

How to put presence and circumstances in one sentence