Suggested Answers for Check Questions
There are two types of unpronounced subjects: the non-independent type and the independent type. The non-independent type of subject has an antecedent with which it shares a theta-role. It has to be lower in the structure than its antecedent. It is always associated with a subject antecedent and it cannot refer outside of the subject clause of another clause. The independent type of unpronounced subject has a theta-role of its own even if it is coreferential with another element. It does not necessarily have to be higher up in the structure than the element it is associated with. It can be coreferential with subjects and objects as well.