Form the plural. boy-messenger sister-in-law text-book pocket-knife statesman fellow-worker merry-go-round man-servant hotel-keeper forget-me-not lady-bird woman-doctor looker-on editor-in-chief passer-by commander-in-chief
Задание

Form the plural.

boy-messenger
sister-in-law
text-book
pocket-knife
statesman
fellow-worker
merry-go-round
man-servant
hotel-keeper
forget-me-not
lady-bird
woman-doctor
looker-on
editor-in-chief
passer-by
commander-in-chief