B) 1. The policemanheard...

2. Mara saw...

3. The children turned back....

4. Tom gave...

5. Ann had....

A) Regular: decide-decided, knock - knocked, answer - answered, open-opened, jump-jumped, turn-turned, rush-rushed, introduce- introduced, shout-shouted, walk-walked, die-died.

Irregular: be- was/were,  have - had, get - got, hear-heard, see-saw,  give-gave, say-said.

4A

be-was/were-been  (irr)

decide/decided  (r)

have/had/had (irr)

get-got-got(gotten in the USA) (irr)

knock-knocked  (r)

answer-answered  (r)

open-opened  (r)

hear-heard-heard  (irr)

jump-jumped  (r)

turn-turned  (r)

see-saw-seen  (irr)

rush-rushed  (r)

introduce-introduced  (r)

shout-shouted  (r)

walk-walked  (r)

give-gave-given  (irr)

die-died  (r)

say-said-said  (irr)

4B

1heard

2 saw

3 shouted/walked/turned back

4 said

 5 got