1:“There's something wrong with the front wheel,"said Uncle Wang
2:"Mum has gone to the supermaket,"the daughter said to her father
3:"I'm doing a biology experiment now."(then)
4:"I’m not free today."(that day)
5:"I must finish my paper this week."(that week)
6:I'll have to stay in the lab until tomorrow."(the next week)
7:I'm going to write a report next week."(the next week)
8:"I watched a very interesting TV programme yesterday."(the day before)