Упражнение 1
Open - opened
work - worked
jump - jumped
ski - skied
skate - skated
love - loved
want - wanted
help - helped
finish - finished
collect - collected
play - played
need - needed
Упражнение 2
1) We opened our books
2) I helped my mum
3) Children liked their new song
4) He skated very well
5) The boys liked to play football
6) A lot of animals lived in the zoo
7) Ann watered the plants