Masculine nouns ending in a soft sign '- ь'

In this episode the teacher talks about Russian cases and Masculine nouns ending in a soft sign '- ь' in particular.

Nominative

Sing. – Огонь вдалеке.
Plur. – Огни освещают дорогу.

Accusative

Sing. – Я ищу огонь.
Plur. – Я ищу огни.

Genative

Sing. – У меня нет огня.
Plur. – У меня нет огней.

Dative

Sing. – Я иду к огню.
Plur. – Я иду к огням.

Instrumental

Sing. – Мы можем очистить это огнем.
Plur. – Мы можем осветить путь огнями.

Prepositional

Sing. – Я разогрею на огне.
Plur. – Я разогрею на огнях.

The courses of Russian as a foreign language with Russian4real take place online via Skype. The teacher works with adults individually since he is convinced that each person must receive maximum time for practice and professional attention while learning a foreign language.