Questions & Answers about Успокойся, всё будет хорошо.
Why does the reflexive ending here use -ся (успокойся) instead of -сь?
Because the imperative base ends in -й (успокой). In Russian, -й is treated as a consonant, so it takes the -ся ending. You only use -сь after a vowel, which is why the formal or plural version is успокойтесь (ending in the vowel -е before the reflexive suffix).
How does успокоиться relate to the other emotion verbs we are learning, like радоваться?
Like радоваться (to be glad) and удивляться (to be surprised), успокоиться (to calm down) is a reflexive verb describing an internal emotional state. However, while you use the Dative case with those other verbs to show what causes the feeling, успокоиться usually stands alone or takes от + Genitive if you need to say what you are calming down from.
Why is the perfective imperative успокойся used here rather than the imperfective?
We use the perfective aspect here because the speaker wants a specific, one-time result right now: achieving a state of calm. The imperfective form успокаивайся would imply an ongoing process, like 'keep calming down,' which lacks the direct, immediate comfort intended in this sentence.
Why does the second part say хорошо (an adverb) instead of an adjective matching всё?
In Russian, general states of being, conditions, or the environment are described using adverbs rather than adjectives. Всё будет хорошо functions like 'Everything will be well.' Using a neuter adjective like хорошее would sound strange, as if you were saying 'Every physical object will be of good quality.'
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