高中英语情态动词详细讲解和例句.docVIP

一、情态动词无人称和数的变化，不能单独做谓语，只能和行为动词或状态动词构成谓语 二、情态动词分为：情态助动词：can(could)、may(might)、must、have to (had to )、ought to 、 shall(should)、will(would) 12个 半情态助动词：dare、need、used to、had better、would better(5个) 三、情态助动词 1.can and could 1)ability：be able to do /manage to do/succeed in doing sth. eg.The army can defeat their enemy. eg.The army is able to defeat their enemy. eg.The army succeed in defeating their enemy. 2)permission:eg.Can I smoke here? eg.You can’t smoke here. 3)possibility:用在否定句、疑问句、感叹句中- eg.This can’t be done by him. 当被用在肯定句中时，表达的是理论上的可能性，不涉及是否真的会发生 eg.even expert drives can make mistakes. 要表达现在或者将来的可能性，用may /might或could. eg.I may leave for Beijing next month. 但在特殊疑问句中，或与副词hardly、only等连用的陈述句中表达可能 性只用can/could Eg.where can the noise be coming from? eg.It can hardly be the postman,he comes only in the morning. 4)有时会：the road can be blocked. 5)could 表示轻微的怀疑或委婉的看法 I’m sorry I couldn’t lend you the book now. His story could be true,but I hardly think it is. 6)could 表示委婉的请求，主要用于疑问句，不用于肯定句 Could you lend me some money? Yes,I can /No,I am afraid not. 7)could 的常用结构：could+动词+比较级 “非常，再.....不过了” It couldn’t be better. Couldn’t +过去分词+比较级“非常，再.....不过了” They couldn’t have tried harder to make me eel welcome. Can’t..too..=can never too“无论怎样...也不为过,越...越好” I can’t thank you too much.I owe my progress to you. Can’t (help/choose) but do/can but +动词原形“