In Turkish, elements of sentence such as the subject, object or complement can also connect to nonfinite verbs instead of finite verbs as predicate. In this way, "subordinate clauses", which are similar to sentence in terms of syntagm but couldn't be used independently like sentence because of the nonfinite verb, are formed. Not being able to use these structures independently requires that they take place as an element in another syntagm, either sentence or word group. Here, the nonfinitive verbs coming forward as the governer element -that is, predicate- enable the syntagmatic structure formed around itself to take place in another syntagm easily. When the sentence elements connected to this kind of predicate are examined, firstly it's seen that they're used in the subordinate clause just as being used in a sentence. Furthermore, in some examples, it can also be observed that they're used systematically in a way peculiar to subordinate clauses. In such examples, they often have important roles in the integration with the upper syntax. In this paper, the subject, which is one of these elements, has been discussed. In this context, it has been investigated when the subject can take place in subordinate clauses and if there isn't a subject in subordinate clauses, how the information given by the subject and which is necessary to complete the meaning is obtained. Furthermore, the roles which the subject can assume in probable structural and semantic connections occuring between the subordinate clause and upper syntagm containing itself have been questioned.