31. Arrange the following nouns into two groups; а) countable nouns, b) uncountable nouns. Say which саn be used with аn indefinite article: apple, literature, sugar, ball, music, sea, news, dress, tomato, soup, mountain, advice, friendship, foreigner, money, class, shop, poetry, corner, ice, artist, sentence, subject, mistake.​

а) countable nouns: apple, ball, sea, dress, tomato, mountain, foreigner, class, shop, corner, artist, sentence, subject, mistake.​

b) uncountable nouns: literature, sugar, music, news, soup, advice, friendship, money, poetry, ice.

С неисчисляемыми никогда не используется неопределенный артикль, лишь the, если нужно подчеркнуть исключительность предмета речи, но это не обязательно.

Соответственно, неопределённый артикль можно использовать со всеми словами из первой группы.

1) what the big ears you have, grandma! 2) how dangerous the place looks! 3) how empty the islands are! 4)what an unusual clock it is! 5) how brave the boys are. 6) what interesting films! 7) how polluted the lake is! 8) how sunny  weather is! 9) what the funny clothes she wears! 10) what the tasty vegetables i've bought!

1.has gone

2.have gone

3.have you passed

4.consulted