This article discusses the fact that despite almost identical syntactically, the Mainland Scandinavian languages sometimes display clear syntactic differences. One instance regards the word order in constructions with låta, LET, where Danish accepts a word order that is not grammatically correct in Swedish. In this connection the impact of the Swedish reflexive pronoun sig is of interest, since in the presence of sig the Danish word order is allowed in Swedish as well. I will claim that there is a crucial difference between the LET-constructions in Danish and Swedish, where the Danish structural description however matches the Swedish one in constructions containing a reflexive pronoun. Furthermore, I will show that the Swedish reflexive pronoun sig is connected to the passive-s, since sig as well as -s sometimes bears a θ-role and sometimes not. The focus is primarily on Swedish and Danish, since Norwegian in most respects behaves like Swedish.