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所属分类:英语资料
style="position: absolute; width:0; height:0; overflow:hidden; left: -9999px; top: -9999px;">初中英语语法知识那么多,最常考的其实就这七个!尚达吴老师
><h3><br></h3><h3>2、含有used to 的句子的反意疑问句不要usedn’t + 主语,而用didn’t + 主语。</h3><h3>——he used to smoke, didn’t he?</h3><h3>——他过去常常吸烟,是吗?</h3><h3>yes, he did。/ no, he didn’t。</h3><h3>是的,他吸。/ 不,他不吸。</h3><h3><br></h3><h3>四、被动语态</h3><h3>被动语态由助动词be加及物动词的过去分词构成,助动词be有时态,人称和数的变化。被动语态的时态是由be的时态决定的,be是什么时态,全句就是什么时态,be动词后面的过去分词不变。</h3><h3><br></h3><h3>1、各种时态的被动语态结构如下:</h3><h3>一般现在时的被动语态:</h3><h3>主语+am / is / are (not)+过去分词</h3><h3>一般过去时的被动语态:</h3><h3>主语+was / were +过去分词</h3><h3>现在完成时的被动语态:</h3><h3>主语+have / has +been +过去分词</h3><h3>一般将来时的被动语态:</h3><h3>主语+will +be +过去分词</h3><h3>过去将来时的被动语态:</h3&
gt;<h3>主语+would / should + be +过去分词</h3><h3>过去进行时的被动语态:</h3><h3>主语+was / were + being +过去分词</h3><h3>过去完成时的被动语态:</h3><h3>主语+had + been +过去分词</h3><h3>情态动词的被动语态:</h3><h3>情态动词+be+过去分词</h3><h3><br></h3><h3>2、被动语态的用法</h3><h3>(1)不知道或没有必要说明动作的执行者是谁,不用by+动作执行者短语。</h3><h3>football is played widely all over the world。</h3><h3>全世界都广泛地踢足球。</h3><h3><br></h3><h3>(2)强调动作的承受者。</h3><h3>the bank was robbed yesterday afternoon。</h3><h3>昨天下午这家银行遭到抢劫。</h3><h3><br></h3><h3>(3)作客观说明时,常采用一种被动语态句型。</h3><h3>it is reported that about twenty children have died of flu in the usa。</h3><h3>据报道美国大约二十名儿童死于流感。</h3><h3><br></h3><h3>3、主动语态的句子变为被动语态的步骤</h3><h3>(1)把原句中的宾语变为主语</h3><h3>(2)动词改为被动形式,即be+过去分词</h3><h3>(3)原来的主语,如果需要的话,放在by后面;如果没必要,可省略。</h3><h3><br></h3><h3>五、虚拟语气</h3><h3>如果我们所说的不是事实,而只是一种假设、愿望、建议或是一种实现不了的空想就用虚拟语气。</h3><h3>注意:条件句分两种,真实条件句和虚拟条件句。只有在虚拟(非真实)条件句中,才用虚拟语气;而在真实条件句中,要用陈述语气。</h3><h3>请比较:</h3><h3>(1)if it is sunny tomorrow , we’ll go to the zoo。</h3><h3>如果明天天气好,我们将会去公园。</h3><h3>在这句话中,明天天气好是完全有可能实现的,并非虚拟、幻想,因此是真实条件句,在本句中,适用“主将从现。”</h3><h3><br></h3><h3>(2)if i were you , i would go at once。</h3><h3>如果我是你的话,我立刻就走。</h3><h3>在这句话中,条件句“如果我是你”,但事实我不可能成为你,这只是假设的,没有实现的可能。当条件实现的可能性很小,甚至没有时,就需要用虚拟语气表示。</h3><h3>虚拟语气表示和现在的事实相反,从句用一般过时,主句用 “should/would/could/ might +动词原形。</h3><h3>例如 :</h3><h3>if i had time, i would go for a walk。</h3><h3>if i were invited, i would go to the dinner party。</h3><h3>if i won a million dollars in the lottery, i would put it in the bank。</h3><h3>if i were you , i’d wear a shirt and tie。</h3><h3>注意:在虚拟语气的句子中,be动词只能用were,不能用was。</h3><h3><br></h3><h3>六、must/might/could/can