4) Дайте форму мн.числа сложных существительных:
Toothbrush, railway-carriage, pocket-knife, housemaid, shoemarker, workman, manservant [ be careful here], classroom, bedroom, inkstand, armchair, table-cloth, windmill, matchbox, woman-teacher [are you sure?], teapot, snowball, bookshop, watchmaker.

Toothbrushes, railway-carriages, pocket-knives, housemaids, shoemakers, workmen, menservants, classrooms, bedrooms, inkstand, armchairs, table-clothes, windmills, matchboxes, women-teacher, teapots, snowballs, bookshops, watchmakers.