Unit 3• Teenagers should be allowed to choose their own clothesI can do●play basketball●watch TV●study in a groupI am allowed to do I can't do●surf the Internet●drive a car●have a part-time job●go out at nightI am not allowed to do He is allowed to play baketball at home.He can play baketball at home.He is not allowed to play baketball at home.He can't play baketball at home.• allow sb to do sth 允许某人做………… .• Eg:Myfather allows me to watch TV on weekends,but he doesn’t allow me go out with friends on nights.• be/be not allowed to doI am allowed to watch on weekends( by my father.)I am not allowed to go out with my friends on nights.grammar 定义 : 表示主语是动作的承受者 .构成 : 助动词 be+ 及物动词的过去分词。助动词有人称、时态和数的变化。用法：当我们不知道谁是动作的执行者，或者没有必要指出谁是动作的执行者，或者只强调动作的承受者时，要用被动语态。 助动词 be 有人称、数的变化 , 其变化规则与 be 作为连系动词时一样。如： The desk is made of wood. The desks are made of wood.He is asked a question by the teacher.助动词 be(am/is/are)+ 及物动词的过去分词不同的时态有不同的被动语态结构不同的时态有不同的被动语态结构1. 一般现在时的被动语态结构：by many students.1.Many students study English.English is studied2.They make shoes in that factory.Shoes are made by themin that factory.I want to play with my friends. But my father doesn’t allow. I think teenagers should be allowed to go out to play with their friends.（应该）允许做某事（ should ﹢ ） be allowed to do shouldn’t+ be allowed to do 4. 含有情态动词的被动语态结构：can/may/must/should + be+ 过去分词1.Amy can take good care of Gina ．by Amy.Gina can be taken good care of2.You 2.You should drinkshould drink more water.more water.More waterMore water should be drunks...
