Youngjun Jang. 2003. Non-Sentence-Final clauses in English. studies in Mordern Grammar 31, 189-197. In this paper, we argue that an explanation based on feature-checking is not enough and in fact not viable in accounting for the expletive it in the subject position and the object position in English. As an alternative, we propose that a kind of ban on non-snetence-final clauses (first proposed in Kuno 1978) is in operation in constraining the distribution of in the a sentence structure.