Ex. 4
1) met , was going
2) is washing , knocked
3) were dancing , came
4) is washing , broke
5) did , saw
Ex. 5
1) will wash
2) will be standing , waving
3) will be
Ex. 6
1) are skating
2) did you skate , were skating , will skate
3) skates
4) What are you doing , am washing
5) What were you doing , am having
6) Are you having
7) Where does your brother , works
8) Was your grandmother sleeping when you came
9) What is your brother going to do tomorrow?
10) Didn't go , am going