happen的用法是什么？

发生; 出现; 碰巧; 偶然遇到;\x0d\happen是不及物动词,它的用法常见的有如下几种情况：\x0d\1.表示“某地(某时)发生了什么事”,常用“sth.+ happen +地点/时间”这一结构来表达,此时主语应是事情.例如：\x0d\The story happened in 2003.这个故事发生在2003年.\x0d\An accident happened in that street.那条街上发生了一起事故.\x0d\2.表示“某人出了某事(常指不好的事)”,要用“sth.+ happen+to sb.”这一结构来表达.例如：\x0d\A car accident happened to her this morning.今天上午她发生了交通事故.\x0d\What happened to you?你怎么啦?\x0d\3.表示“某人碰巧做某事”,要用“sb.+ happen+ to do sth.”这一结构来表达.例如：\x0d\I happened to meet a friend of mine in the street yesterday.昨天我碰巧在街上遇到了我的一个朋友.\x0d\4.happen表示“碰巧或恰巧发生某事”时,还可用“It happens / happened that...”这一结构来表达.例如：\x0d\It happened that Brian and Peter were at home that day.碰巧那天布莱恩和彼得在家了.\x0d\It happened that he had to take part in a meeting that afternoon.碰巧那天下午他不得不参加一个会议.\x0d\注：that从句中的主语是人时,此种结构可以与“sb.+ happen + to do sth.”结构互换.例如：\x0d\It happened that Brian and Peter were at home that day.= Brian and Peter happened to be at home that day.\x0d\词形变化：时态：happened，happening，happens。\x0d\同义词：bechance，befall；materialise，materialize；encounter，find，bump，chance；come about，fall out，go on，hap，occur，pass，pass off，take place。\x0d\反义词：dematerialise，dematerialize。\x0d\单词分析：这些词语都可表示“发生”之意。\x0d\happen：普通用词，泛指一切客观事物或情况的发生，强调动作的偶然性。\x0d\occur：较正式用词，可指意外地发生，也可指意料中的发生。\x0d\chance：侧重事前无安排或无准备而发生的事，特指巧合。\x0d\take place：多指通过人为安排的发生。\x0d\英语句子\x0d\If this should happen, the speaker might feel down in the mouth.\x0d\如果事情发生了，说话者会因为说错话而难过。\x0d\Happening by chance or accident;fortuitous.\x0d\偶然的偶然或意外发生的;偶然的\x0d\Nothing have happened in the interim.\x0d\在过渡期间，没发生过任何事。\x0d\A train of events happened last year. \x0d\去年发生了一系列的事情。\x0d\He happened on the book in an secondhand bookstore.\x0d\他碰巧在一家旧书店里发现了这本书。