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

Decided, agreed, played, watched, watered, studied, opened., closed., waited., brushed., tried., rissed., called., invited., observed.