Module2TheRenaissance教案02（GrammarandUsag）（外研版选修8）.doc

PAGE  PAGE 7 英语高二下外研版选修8 Module 2教案02（Grammar and Usag） 英语：Module 2《The Renaissance》英文教案（2）（外研版选修8） Period 2 Grammar and Usage--Review of non-finite verbs ▇Goals To review ~ing form, the ~ed form and to + infinitive; ▇Procedures Step 1: Review the participles used as adverbials A present participle phrase is used to replace a sentence. A. When two actions by the same subject occur simultaneously it is usually possible to express one of them by a present participle. The participle can be before or after the finite verb. e.g. He rode away. He whistled as he went. = He rode away whistling. B. When one action is immediately followed by another by the same subject the first action can often be expressed by a present participle. The participle must be put first. e.g. He opened the drawer and took out a revolver.= Opening the drawer and took out a revolver. It would seem more logical here to use the perfect participle and say Having opened, but this is not necessary except when the use of the present participle might lead to ambiguity。 C. When the second action forms part of the first, or are a result of it, we can express the second action by a present participle. e.g. She went out, slamming the door. The perfect participle (active) having done The perfect participle emphasizes that the first action is complete before the second one starts, but it is not necessary in the combinations of this kind, except when the use of the present participle might lead to confusion. Reading the instructions, he snatched up the medicine. “might” give the impression that the two actions were simultaneous. Here therefore the perfect participle would be better. Having read the instructions, he snatched up the medicine. The past participle (passive) and the perfect participle (passive) A. The past participle can replace a subject + passive verb just as the present participle can replace subject +active verb: She enters. She is accompanied by her mother. = She enters, acc