假设你叫John,你和Tom是好朋友,他邀请你去参观他家的农场,你因为太忙,不能去.请根据以下提示写一篇70

Dear Tom,
Thank you for your invitation。I'm sorry i can' t visit your family's farm。I am really busy this weekend。 This evening i have to visit my grandparents。 And on Saturday i have to help my dad in the garden。 On saturday afternoon I 'm going shopping with my mom。I like shopping。On Sunday I have to study for my Chinese test 。This time I really want to get a good grade。And on Sunday evening 。I'm going to the concert with my frends。
Maybe next time 。Please write me soon。
Yours,
John
我们也才上完这个单元。希望你能采纳。