He told his girlfriend that he (buy) .... a ring the day before

1.    He told his girlfriend that he (buy)                        a ring the day before.

2.    He warned the boys (not/swim)                         out too far.

3.    Joanna suggested (go)                              for a walk because they had been working all day.

4.    My mother encouraged me (collect)                         for recycling.

5.    Hello, Jim. I didn’t expect to see you today. Sophie said you (be)                            ill.

6.    The scientist said the earth (go)                        the sun.

7.    The man (sit)                  next to me kept talking during the film, which really annoyed me.

8.    The exercises which she is doing (be)                            very easy.