Unexplained Mysteries of the Natural World必修必修 4 411. He claims to have seen a round black creature moving quickly through the water.他声称看到一个圆形的黑色动物在水中快速游动。重点句型重点句型22. It is 2,189 metres high and covers an area of about ten square kilometres.它海拔2,189米，占地约10平方公里。3. There have been reports of monsters in Lake Tianchi since the beginning of the last century自上世纪初以来，一直就有关于天池怪物的报道重点句型重点句型31. He claims to have seen a round black creature moving quickly through the water.他声称看到一个圆形的黑色动物在水中快速游动。to have done是不定式的完成式,主要有两种用法：不定式所表示的动作发生在谓语动作或状态之前。表示过去未能实现的愿望、打算、计划等。常用形式为：wanted, planned, hoped, intended, meant, to have done。句型探究句型探究4Doctors claimed to have discovered a cure for the disease.医生声称已找到了该疾病的疗法。He pretended to have done his homework.他假装已经完成了作业。I wanted to have picked you up at the airport yesterday, but I was too busy. 昨天我本打算去机场接你,可我太忙了。句型探究句型探究52. There have been reports of monsters in Lake Tianchi since the beginning of the last century自上世纪初以来，一直就有关于天池怪物的报道There be 句型表示“存在，有”，主语是be后的名词，there 为引导词。There be 句式中的谓语动词用单数还是复数取决于它后面紧跟的名词。There is a cup, a book and two pens on the table.桌上有一个杯子、一本书和两支笔。句型探究句型探究6There be 句式可以用情态动词，be也可以有各种时态。There may be a good wheat crop this year.今年小麦可能会有一个好收成。There hasnt been any rain for some days.几天来一直未下雨。There be 结构除可用be外，还可以与其他表示存在、状态等意义的动词，如lie, stand, exist, live, seem等连用。There existed different opinions on this question.在这个问题上存在着不同看法。句型探究句型探究7同学们来学校和回家的路上要注意安全来学校和回家的路上要注意安全同学们来学校和回家的路上要注意安全来学校和回家的路上要注意安全