Mary发邮件邀请Li Ming星期四星期五去野营，但是Li Ming星期四星期五都很忙，以下是Li Ming星期四星期五的活动，请你以Li Ming的名义，根据表内的内容，给Mary回一封电子邮件，说明不能去野营的理由。60词左右。
| Day | Activity | Day | Activity |
| Thursday morning | go to school | Friday morning | clean the room |
| Thursday afternoon | have an English lesson | Friday afternoon | visit grandmother |
| Thursday evening | go shopping | Friday evening | babysit sister |
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