Выпиши слова перед которыми можно употребить артикли (a/tne) cat, frog, his, cockerel, Ahh, sigh, clock, red, seven, pen, pencil, big, is, stick, Tom, hen, cah, black, teh, dog, box.

A cat, a frog, his, a cockerel, Ann, a sigh, a clock, red, seven, a pen, a pencil, big, is, a stick, Tom, a hen, a cat, black, ten, a dog, a box.

A / an is indefinite article. A / an is used with countable nouns. A is used before consonant (a pen). An is used before vowels (an eye). The meaning of indefinite article is one. We don't use indefinite article before names and pronouns. We don't use indefinite article before adjectives and verbs. We don't use indefinite article with numerals.