EXERCISE 1. Give the plural of the following nouns.

А. А pin, а hat, а fox, а baby, а day, potato, а volcano, а piano, а photo, а knife, а roof, а half, а leaf, а cliff, а chief, а life, а family, а queue, а bath, а berry, а valley, а century, а salmon, а taxi, а person, а penny, а watch, а virtuoso, а lily, а woodworm.

В. А man, а woman, а German, а foot, а tooth, а sheep, а ship, а fish, an ох, а fox, а child, а fireman, а mouse, а swine, а house, а louse, а goose, а mongoose, а deer, а means, а series, а species, аn aircraft, an offspring, а Swiss, а Japanese, а Maltese, а Portuguese, а Chinese, а Milanese.

С. А passer-by, а mother-in-law, а room-mate, а forget­-me-not, а merry-go-round, а fellow-worker, a man-of-war, а school-inspector, а commander-in-chief, а boy-messenger, а personnel-manager, а woman-driver, а man-servant, а hanger-on, а face-lift, а spoonful, а cupful, а boyfriend, а grown-up, an office-block, а workmate.

EXERCISE 2. Consult the table and give the plural of the following foreign words.

a) cactus, fungus, radius, stimulus, genius;

b) alga, formula (in science), vertebra, antenna;

с) bacterium, curriculum, datum, medium, memorandum, stratum, millennium;

d) index (in mathematics, in books);

е) appendix (in books, in medicine);

f) analysis, axis, basis, crisis, diagnosis, hypothesis, oasis, parenthesis, thesis;

g) criterion, phеnоmеnоn.

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