Add -(ed) to given verbs 1 decide 2 agree 3 play 4 watch 5 water 6 study 7 open 8 close 9 wait 10 brush 11 try 12 riss 13 call 14 invite 15 observe

Вот формы с окончанием -(ed):

1. decide → decided

2. agree → agreed

3. play → played

4. watch → watched

5. water → watered

6. study → studied

7. open → opened

8. close → closed

9. wait → waited

10. brush → brushed

11. try → tried

12. riss → rissed (если имелось в виду rise, это неправильный глагол: rose/risen)

13. call → called

14. invite → invited

15. observe → observed