on board乘(车,飞机),on call听候召唤, on duty值班, on earth到底, on fire着火, on foot步行,on guard在岗,on hire雇用,on holiday度假 ►at常见用法 at构成的词组比较多,要细心区分。 1.动词+ at arrive at抵达,call at访问某地, catch at(it)当场抓住, come at攻...
1. call on/upon sb to do sth号召某人干某事;恳求?请(叫)某人干某事?例如: The headmaster called on the students to work harder. 校长号召学生们更努力地学习? We are calling upon you to help us. 我们恳求你的帮助? 2. call on/upon sb拜访;看望某人; call at ...
常见动词: want, wish, ask, tell, order,beg, allow, permit, help, advise, persuade, cause, force, warn, invite, urge,encourage, prepare, call on, would like, wait for, etc. I got them to join us in the discussion. They are waiting for the school bus...
更多内容请点击：考研语法入门篇:介词on/at用法大全 推荐文章