This paper will deal with several aspects of the potential features of English verb complement clauses from the view point of Applied Linguistics. While briefly describing the main characteristics of the infinitive, ING and THAT clause functioning as the object of verbs, and some special features of infinitives we found, based on BNC, are explained, and necessary contrasts between complement clauses are provided. Attention is paid to the target situation where English is learned and taught as a foreign language.