假定你是李华，与留学生朋友Bob约好星期天下午一起去书店，因故不能赴约，请给他写一封邮件，内容包括：
1.表示歉意。
2.说明原因 ：父母忙于工作，所以要去照顾生病住院的奶奶。
3.另约时间。
注意：1.词数80字左右。
2.可适当增加细节，以使行文连贯。
Dear Bob，
-----------
-----------

Yours sincerely，
Li Hua

【考点】提纲作文．

【答案】Dear Bob，
I'm sorry to say that I cannot go to the bookstore with you on Sunday afternoon.I have to take care of my sick and hospitalized grandmother because my parents are busy with work.I hope the change will not cause you too much trouble.
Shall we go on Monday morning？We can set out early so that we'll have more time to read and select books.If it's convenient for you，let's meet at 8：30 outside the school gate.If not，let me know what time suits you best.I should be available any time after school next week.
Yours sincerely，
Li Hua