Open a brackets, using Present Continuous
1. Tim (to have) a good time at his friend`s party now.
2. Mike and Linda (to swim) now.
3. Helen (to have) a rest her breakfast at the moment.
4. Liza (to have) a rest at the moment.

1is having2are swimming3is having4is having

1. Tim is having a good time at his...                                                                           2. Mike and Linda are swiming now.                                                                           3. Helen is having a rest...                                                                                            4. Liza is having a rest...