Unit 7 Teenagers should be allowed to choose their own clothes1.语态： ①英语有两种语态：主动语态和补动语态 主动语态表示是动作的执行者 被动语态表示主语是动作的承受者 Cats eat fish. （主动语态）猫吃鱼。 Fish is eaten by cats. (被动语态) 鱼被猫吃。 ②被动语态的构成 由“助动词be ＋及物动词的过去分词”构成 助动词be 有人称、数和时态的变化，其变化规则与be 作为连系 动词时完全一样。时态被动语态结构例句一般现在 时amare +过去分词is English is spoken in many countries.一般过去 时was +过去分词were + 过去分词This bridge was built in 1989.情 态动 词can/shouldmay +be+过去分词must/…The work must be done right now. ③被动语态的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，或者只需强调动作的承受者时，要用被动语态。2. allow sb. to do sth. 允某人做某事（主动语态）如： Mother allows me to watch TV every night. 妈妈允 我每晚看电视。 be allowed to do sth. 被允做某事（被动语态）如： Lily is allowed to go to Qinzhou. 被允去。3. get their ears pierced 穿耳洞 让/使（别人）做某事 get sth. done (过去分词) have sth. done (过去分词) 如：I get my car mended. = I have my car mended. 我让别人修好我的车4. enough 足够 形容词＋enough 如：beautiful en ough 足够漂亮 enough＋名词 如：enough food 足够食物 enough to 足够…去做… 如：I have enough money to go to Beijing. 我有足够的去。5. stop doing sth. 停止做某事 Please stop speaking.请停止说话。stop to do sth. 停止下来去做其他事 Plea |
