Breakdown of Il n'est pas normal de se sentir toujours triste.
être
to be
toujours
always
ne
not (used before the verb)
pas
not (used after the verb)
Questions & Answers about Il n'est pas normal de se sentir toujours triste.
Why use Il n'est pas normal instead of Ce n'est pas normal?
Both mean "It is not normal". In this specific structure (impersonal expression + adjective + infinitive verb), Il est is the traditional, formal choice. In casual spoken French, you will very often hear C'est, but Il est is what you will usually see in writing and formal speech.
Why do we need the word de before se sentir?
Why is the verb se sentir reflexive here?
Where should adverbs like toujours go when used with an infinitive verb?
Usually, adverbs follow the conjugated verb. But here, se sentir is an infinitive (unconjugated). With infinitives, adverbs of time or frequency like toujours (always) typically go right after the verb itself, giving us se sentir toujours triste.