Hola, necesito ayuda con esto, conozco del tema pero no se porque esto me confunde mucho?

1 - a was preparing lunch when they come.

B) tom was very unlucky

c) who was that nice girl walking by the pub

d) last weekend susan fell was breaking her les

e) when entering the cafeteria mary was having lunch with peter.

F) we driving to berlin in robert's new car.

G) the sun shone was getting up this marning

h) ann finally told us the whole star about peter

2a) walked, meets

b) arrived, was,

c) speaked came

d) readed, hearded

e) leaved, shines rained

f) arrived , was , studied

g) rescue, was

h) to do

i) fell, hurted, rided

j) to do peter, knocked

k) weared.