Adverbs "сколько стоит?", "сколько времени?", "как долго?"

Hello, dear student!

Today we are going to talk about adverbs, specifically the following adverbs:

Сколько стоит? [skol'ka stoit?] - How much/many does it cost?
Сколько времени? [skol'ka vremini?] - What time is it?
Как долго? [kak dolga?] - How long?

We use the word "сколько" to ask and get to know the information about quanity. Using the figures 2, 3 and 4 as notional numbers or a part of bigger numbers, we use nouns in the genitive case. For example:

Я работал всего три часа [ya rabotal fsivo tri chisa] - I worked only 3 hours.

In this sentence we have the number 3 and the following number "час" [chas] (hour) which has the form "часа" [chisa] in the genitive case (Сколько? - How much? три - three, Чего? - What? часа - hours)

The following numbers require after themselves genitive case in plural:

• Numbers from 5 to 20
• Numbers ending with 5, 6,7,8 or 9
• Dozens, hundreds etc.: 10, 20, 100, 1000..
• Words "много" [mnoga] - much/many, "мало" [mala] - few/little, "сколько" [skol'ka] - how much/many, "несколько" [neskal'ka] - some/several.

Сколько стоит эта игрушка? [skol'ka stoit ekhta igrushka?] - How much does this toy cost?

Восемь рублей! [vosim' rubl'ej] - Eight rubles!

In this interrogative sentence we have the adverb "сколько", in the response - "восемь рублей", after the figure 8 we use the noun in the genitive case, plural.
Let's look at some more examples:

Как долго вы живёте в Москве? [kak dolga vy zhiv'ot'e v Maskve?] - How long have you lived in Moscow?

Уже семь лет [uzhe s'em' let] - Already 7 years

Сколько времени потребуется для этого? [skol'ka vremini patrebuitsa dl'a ekhtava?] - How much time does it need?

Десять часов [des'at' chasof] - Ten hours