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We use 'a' with singular nouns, so it refers to one item rather than more than one. It also tells us that the speaker is not talking about a particular computer. The answer to your question, therefore, is that 'a' carries both of these meanings, not just one of them.
Singular nouns. We use: a / an + singular countable noun. We use an with singular countable nouns that start with a vowel. an apple a apple. Plural nouns. Most nouns add -s. apple → apples banana → bananas. We use some with plural countable nouns in positive sentences.
Notice that we use the indefinite article a/an ONLY with singular countable nouns: a dog, an egg, a very big man, an extremely delicious meal.
Nouns used only in the singular. Some nouns are used only in the singular, even though they end in -s. These include: the names of academic subjects such as classics, economics, mathematics/maths, physics; the physical activities gymnastics and aerobics; the diseases measles and mumps; and the word news: Maths was never my best subject at school.
de English Grammar Today. Nouns used only in the singular. Some nouns are used only in the singular, even though they end in -s. These include: the names of academic subjects such as classics, economics, mathematics/maths, physics; the physical activities gymnastics and aerobics; the diseases measles and mumps; and the word news:
7 de oct. de 2022 · 1 If a singular noun is the subject of a sentence, the verb must use the singular form. In English, the grammar law of subject-verb agreement states that the verb of a sentence must match the number of the subject. If the subject is singular, the verb must be singular as well; if the subject is plural, the verb must be plural.
The most frequent general determiner is the indefinite article a/an used with singular nouns: A man came this morning and left a parcel. He was wearing a big coat and a cap. We use no determiner with plural nouns and uncount nouns: Girls normally do better in school than boys. (plural nouns) Milk is very good for you. (uncount noun)
