1) you shouldn’t worry about your weight
2)we need to focus on the problem our discussion
3)people could arrive from all over the country to see him
4)they ought to take care of their parents
5)You older brother have to quit smoking
6)i have to read all the instuctions
7)you must bring the book to the library in 2 weeks
8)can I give classmates’ notebooks?
9) yesterday I had to train my younger sister
10) don't worry about your friend. he can solve all his problems