四、虚拟语气(Subjunctive mood) In English,when we express hypothetical and non-factual meanings,we need to use subjective mood of verbs.There two forms of the subjunctive:be-subjective and were-subjective In this lecture the uses of the subjunctive mood are dwelt on and we also discussed its forms and some special subjunctive sentence constructions. 五、情态动词(Modal auxiliary) As has been pointed out before,English verbs,in terms of their functions in forming verb phrases, fall into two major categories:main verbs and auxiliaries.Auxiliaries can again be divided into primary auxiliaries(基本助动词)，modal 5 四、虚拟语气（Subjunctive mood） • In English, when we express hypothetical and non-factual meanings, we need to use subjective mood of verbs. There two forms of the subjunctive: be –subjective and were-subjective. In this lecture the uses of the subjunctive mood are dwelt on and we also discussed its forms and some special subjunctive sentence constructions. 五、情态动词（Modal auxiliary） • As has been pointed out before, English verbs, in terms of their functions in forming verb phrases, fall into two major categories: main verbs and auxiliaries. Auxiliaries can again be divided into primary auxiliaries (基本助动词), modal