На этих форумах всегда много разных мнений.

Questions & Answers about На этих форумах всегда много разных мнений.

Why is it на этих форумах and what case is this?
"On these forums" describes a location, so we use the Prepositional case after the preposition на. In the plural, masculine nouns like форум take the ending -ах to become форумах. The word for "these" (этот) becomes этих in the Prepositional plural.
Why are we using the Genitive case for разных мнений?
Whenever you use words expressing quantity like много (many or a lot), the following noun and its adjectives must be in the Genitive case. Since we are talking about multiple opinions, we use the Genitive plural form here.
How is the Genitive plural word мнений formed?
The dictionary form is мнение (opinion), which is a neuter noun ending in -ие. For neuter nouns ending in -ие, the Genitive plural is formed by changing the ending to -ий, giving us мнений.
Both этих and разных end in -х. Are they in the same case?
No, they are actually in different cases! этих is in the Prepositional plural to match форумах, while разных is in the Genitive plural to match мнений. They look identical because plural adjectives and demonstratives (like "these") use the exact same endings (-ых or -их) for both the Prepositional and the Genitive cases.

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