Resposta:

a) bought

b)cost

c) sold

d) flew

e) sent

f) got

g) begun

Resposta:

Past Form

A - bought (buy);

B - cost (cost);

C - sold (sell);

D - flew (fly);

E - sent (send);

F - got (get);

G - began (begin).

Vowel Changes to A:

• begin → began.

Vowel Changes to O:

• get → got.

Past form Ends in D:

• sell → sold.

Past form Ends in T:

• send → sent.

No Changes:

• cost → cost.

Past form Ends in GHT:

• buy → bought.

Past form Ends in EW:

• fly → flew.

Espero ter ajudado :)