问题详情：
假定你是李华，与留学生朋友Bob约好一起去书店，因故不能赴约．请给他写封邮件, 内容包括： 1．表示歉意 2．说明原因 3．另约时间 注意： 1．词数100左右； 2．可以适当增加细节，以使行文连贯．
【回答】
Dear Bob， I'm sorry to say that I cannot go to the bookstore with you on Friday afternoon．I have just found that I have to attend an important class meeting that afternoon．（高分句型）I hope the change will not cause youtoo much trouble．（写信目的及缘由） Shall we go on Saturday morning？We can setout early so that we'll have more time to read and select books．（高分句型）If it'sconvenient for you，let's meet at 8：30 outside the school gate．If not，let meknow what time suits you best．（高分句型）I should be available any time after school nextweek．（另约时间） Yours， Li Hua
知识点：提纲作文
题型：书面表达
