Resposta:

31 - a) didn't tell

b) didn't wear / wore

c) didn't film / took

d) didn't swim

e) didn't make

f) traveled / traveled

g) went

32 - a) didn't see

b) didn't make

c) didn't hear

d) didn't go

e) didn't tell

f) didn't swim

g) didn't get

h) didn't make

i) didn't run

33 - a) went / didn't see / saw

b) saw / didn't see

c) wore / were

d) swam / didn't swim

34 - b) I didn't see Tyler at school yesterday

c) They didn't go to the soccer practice last thursday

d) Erick didn't ride his bike to the race

e) The music teacher didn't tell us Bethoven's story

f) We didn't have lunch at 1 p.m yesterday

g) Jessica and Juan didn't write their History paper this morning

h) Mr. Kim didn't make a presentation on scientific discoveries last class

i) My family didn't take many photos during our last vacation trip