The article concentrates on the German double perfect forms and tries to find an answer to the following 
question: is it possible to show that – contrary to traditional assumptions – the German double perfect is a 
systematical and therefore acceptable verbal form of German? First, the question will be substantiated by 
four experiments and will get an empirical answer. Secondly, a syntactic and semantic analysis of the 
double forms will be proposed and the empirical data will be discussed in view of this proposal