Natascha Müller presents a very interesting analysis of the structure of the German subordinate clause in bilingual first language acquisition. The main issue in this paper is to explain the fact that some bilingual children – but not all of them – display non-target language structures in German subordinate clauses. That is, the finite verb does not appear in the final position of the subordinate clause. These non-target structures can in part be explained by transfer, but this cannot be the whole story, because some monolingual children produce these structures as well. Bilingual children, though, appear to have problems with the German subordinate clause more frequently than monolingual children. Interestingly, acquiring the target structures is a slow process for children who produce non-target structures. Ivar, the French-German child Müller discusses in most detail, for example, needs two years to acquire the correct position of the finite verb in German subordinate clauses. Müller argues that the problems arise because the input children receive is ambiguous: the finite verb does not always appear in the finite position in German subordinate clauses in adult speech. The ambiguity of this situation opens the way to transfer. In their uncertainty, the children turn to their other language as a relief strategy.