I don't think there is much flexibility and freedom in Russian. There is a lot of conventionality in forming words and sentences. You can't form sometimes something because you just can'tLike you say 'Мы победим' but you can't say the same in singular 'Я победю/побежду'. Why? I have no clue.
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In English there is just few addings like 'ed, ing', and apart some exceptions, there is not much hesitation to put them.