Pronoun-Numerals

The pronoun-numerals are:

столько	so much, so many
сколько	how much, how many
несколько	several, a few

These pronouns are declined only in the plural.

	Singular		Plural
NOM.	столько воды		столько учеников
GEN.			стольких учеников
DAT.			стольким ученикам
ACC.	столько воды		столько учеников (or:  стольких учеников)
INSTR.			столькими учениками
PREP.			стольких учениках

Сколько and несколько are declined similarly.

Note:  Столько is sometimes classified as a definite pronoun, сколько – as an interrogative, несколько – as an indefinite.

Usage of Pronoun-Numerals

1.   In the nominative and in the inanimate accusative столько and сколько are followed by the genitive case of the noun (singular or plural):

Здесь стoлько снега!	There is so much snow here!
Там было стoлько людей.	There were so many people there.
Скoлько книг вы купили?	How many books did you buy?

Несколько is followed by the genitive plural:

Он написал несколько писем.

He wrote several letters.

2.   In the oblique cases, these pronouns agree with their nouns, which are always in the plural.

для нескольких учеников	for several pupils
скольким людям	to how many people
о стольких вещах	about so many things

3.    The animate accusative of these pronouns may either coincide with the genitive:

Я встретил нескольких учеников.

I met several pupils.

    or, with the nominative:

Я встретил несколько учеников.	I met several pupils.
Мы видели столько туристов!	We saw so many tourists!

The latter form (несколько, стoлько) is currently preferred.