As I understand it's mixed. Because our verbs ends with -ть - soft sound. But our nouns ends with strong consonants and 50/50 strong and soft vowels, strong and soft signe. Adverbs and adjectives ends more with strong and soft vowels. And everything change endings depends on the gender, number and case. Where we have so many different endings, which is mixed too. 🤓🎓

I don't understand, what you mean. Russian hasn't " hard or soft" words. We have hard or soft letters. We have the next think: Always soft consonants: й, ч, щ Always solid sounds: [ж] , [ш] , [ц]. In the case of the rest of the consonants - if after them there are vowels е, ё, ю, я, и или ь, then the consonants will be soft. If the vowels А, О, У, Ы, Э follow, then the consonants will be solid.

Hi, native speakers (apart from those who teach Russian for foreigners or some linguists) have no idea about what hard or soft stems are. We never divide them like this. This division was probably invented to make it easier for foreigners to understand how the system of hard/soft sounds work in Russian. We simply know the pronunciation of the words, so we don't need any rules for that. What we have to know is that ь along with the vowels e,ё, и, ю, я make consonants sound soft. The answer to your question is: look at the base form of a word. If the last consonant is hard, it's "hard stem" and vice versa. Does that make sense?

In school, we never divided stems on hard and soft... What are hard and soft stems? It doesn't matter which letter is the last in stem.