Some nouns ending in-s, have a singular meaning, and agree with the verb in the singular. These are nouns: news, a works, barracks, some of the names of sciences (mathematics, economics, physics, phonetics, and statistics), etc.

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Nouns that are used only in the plural
Some nouns in meaning can be used only in the plural form. These are nouns that denote binary objects, such as: tongs, trousers, etc.

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. In the plural form used as nouns, such as goods merchandise, goods, embers ember; dregs sediment, dregs, valuables and other jewelry
The discrepancy between the numbers of some nouns in English, with the number of the nouns in Russian
. Some nouns are used in real English in their basic meaning only in the singular, whereas the corresponding nouns in Russian are only used in the plural, for example: ink, money, hair, and fruit.
Note.

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The form of moneys used in the special values ​​in law, form a hair-hairs have the value of individual hair: Not has some grey hairs. He has a few gray hairs, inks represent a form of sorts of ink and form fruits means fruit varieties:
 Possessive.
Article in conjunction noun in possessive noun plus most often refers to the first noun, i.e. the noun in the possessive case. Therefore, if the possessive is a proper noun, the article is not used.
Note.
 Rather than form possessive case of nouns can be used to turn the pretext of: the professor's lectures = the lectures of the professor.
Possessive case form may take some nouns denoting inanimate objects and concepts. These include:
1. Nouns ship, world, country, nature, earth, sun, moon, water, ocean, and others.
2. The names of countries, cities, months and seasons.
3. Nouns denoting time and distance: a year's absence; a day's journey; a mile's distance, etc. In this case, the possessive is set to measure.