typedef struct 用法详解和用法小结【最新5篇】.docx
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1、typedef struct 用法详解和用法小结【最新5篇】typedef struct 用法详解和用法小结 篇三there be 用法小结 篇五 there be 用法小结 1、 基本结构 There be + 主语 + 地点/ 时间状语。如: There is a computer in the room. 房间里有一台电脑。 There are two TV plays every evening. 每晚有两场电视剧。 2. 主谓一致 要采取就近一致原则,和靠近 be 的主语一致。如: There is a pen, two rulers in the box. 盒子里有一只钢笔,两把尺
2、子。 There are two boys and a teacher at the school gate. 门口有两个男孩,一个老师。 3. 主语后的动词形式 在there be 句型中,主语与动词是主动关系时用现在分词;是被动关系时用过去分词。如: There is a purse lying on the ground. 地上有一个钱包。 There are five minutes left now. 现在还有5分钟。 4. 反意疑问句。 反意疑问句应与 there be 对应,而不是依据主语。如: There is a radio on the table, isnt there?
3、 桌子上有一台收音机,是吧? There are more than fifty classes in your school, arent there? 你们班有50多名学生,是吧? 5、 there be 与 have 的替换 there be 表示所属时可与 have 替换。 There is nothing but a book in my bag. = I have nothing but a book in my bag. 包里只有一本书。 6、 there be 后接不定式时常用主动形式表示被动意义。如: There is a lot of work to do. 有许多工作要做
4、。 注意:当该句型主语是 something, anything, nothing 等不定代词时,后面的不定式用主动形式或被动形式,意义各不同。 There is nothing to do. 没有事可做。 There is nothing to be done. 没有办法(束手无策)。 7. 与其它词连用,构成复合谓语。如: There may be a rain this afternoon. 今天下午可能有雨。 There used to be a cinema here before the war. 战争之前,这儿有一家电影院。 8. 变体 there be 结构中的 be 有时可用
5、 live, stand, remain 等代替。如: Once there lived a king who cared more about new clothes than anything else. 从前有位国王喜欢新服胜过别的任何东西。 9、 习惯用语 There is no good /use (in) doing sth. 做某事没有好处/用处; There is not a moment to lose. 一刻也不能耽误。例如: There is no good making friends with him. 和他交朋友没有什么好处。 He is very ill. Sen
6、d him to hospital. Theres not a moment to lose. 他病得厉害,把他送到医院去,一刻也不能耽误。 There be表示存在的“有”,他有各种时态,如: 一般现在时:there is/are;一般过去时:therewas/were 一般将来时:there will be;过去将来时:there would be; 现在完成时:there has/have been;过去完成时:there had been 要特别注意be going to 在there be 句型中的运用。例如: There is going to be a film in the m
7、eeting hall.学校礼堂里将有一场电影。 还可扩展为许多其它句型,下面笔者对There be句型的扩展作一归纳。 一There be+主语 这种句式表示事物的客观存在,There be放在句首,而把真正的主语放在后面,可以用来表示现在时、过去时、完成时和将来时。例如: There is a boy on the playground.操场上有个男孩。 There has been a lot of rain this month. 这个月雨水很多。 There will be an announcement soon. 不久会发布告。 二,There are + n(复数名词/不可数名
8、词)+ and + n(复数名词/不可数名词) 该句型表示同一类人或物的不同性质,尤其表示有好坏优劣之分,意为“有各种各样的”、“种种不一”等。如: There are friends and friends. 朋友有种种,有益友,有损友。 There is tea and tea. 茶叶有好有差。 三 There be+名词+分词 这种句式中分词可以是现在分词,也可以是过去分词。doing表示动作和前面名词有主谓关系,过去分词done和前面名词有被动关系。如: There is a man sitting on the fence. 有个人正坐在篱笆上。 There was a car st
9、olen last night. 昨晚有辆车被偷了。 这种句式可以用“主语+be+分词”这一结构来代替。例如: There is a boy playing with a puppy in the yard. ( = A boy is playing witha puppy in the yard.) 一个男孩正在院子里和一只小狗玩耍。 There has been more money spent on armaments than on famine relief. (=More money has been spent on armaments than on famine relief
10、.) 花在军备上的钱比花在救灾上的钱还多。 四, There be+名词+动词不定式 这种句式中的及物动词(动词不定式)也可改成被动式, 意为“(没)有要做”。例如: There is a lot of work to do (to be done)。 有许多工作要做。 There was no time to wait for you. 没有时间再等你了。 注意:There is nothing to do与There is nothing to be done. 含义不同。前者意为:“无事可做”,后者意为“没有办法”。试比较: There is nothing to do-Im bored
11、. 无事可做-我感到闷得慌。(=There is nothing to entertain me.) 没有什么活动来消遣。 There is nothing to be done-well have to buy another one. 没有办法-我们只好另外买一个了。(= There is no way off putting it right.) 五 There is+no+动名词 这种句式可与“It is impossible+动词不定式”替换,意为“无法做某事”。例如: There is no stopping him. (=It is impossible to stop him.
12、)无法阻止他。 There is no guessing what will happen. 无法猜到将会发生什么。 六, There is(no) need for+名词 该句式意为“(不)需要”。例如: There is no need for anxiety. 不需要担心。 There is a great need for a book on this subject. 非常需要有一本关于这个题目的书。 七, There is no need+动词不定式。例如: There is no need for him to come.不需要他来了。 There is no need (for
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