after意思是“在……之后”。常见用法如下:1、遵循“主将从现”原则。如:He will go to Beijing to work after he graduates from the university .他大学毕业后将去北京工作。2、从句表示的动作发生在主句动作之前 ,如果强调从句的动作发生在前,从句谓语要用过去完成时,主句用一般过去时 。如:He went out for a walk after he had finished the work .他完成这项工作后他出去散步。3、从句表示的动作发生在主句动作之前,如不强调动作的先后,主句和从句均用一般过去时。如:He went to bed after he finished his homework last night .昨晚他完成作业后上床睡觉。