4.а) образуйте множественное число существительных: a bag, a fish, a mouse, a teeth, a dish, a cap, a plate, a match, a way, a city, a dress, a deer, a pistol, a book, a wife. б) образуйте единственное число существительных: postmen, mice, swine, oxen. 5.напишите 3 формы глаголов: to bring, to become, to catch, to do, to make, to set, to think, to eat, to write, to speak.

1 bags, fish, mice, teeth, dishes, caps, plates, matches, ways,cities, dresses, deer. pistols, books, wives.
2 postman, mouse, swine, ox
3 bring-brought-brought
become-became-become
catch-caught-caught
do-did-done
make-made-made
set-set-set-
think-thought-thought
eat-ate-eaten
write-wrote-written
speak-spoke-spoken