adverb
Describes a habitual or constant state or action. Very common in everyday speech.
彼はいつも遅刻する。
He is always late.
私はいつも朝コーヒーを飲
I always drink coffee in the morning.
adverb
Used with a negative verb to mean 'never'. The combination いつも～ない is a common pattern.
彼はいつも約束を守らない。
He never keeps his promises.
この店はいつも混んでいない。
This shop is never crowded.
noun which may take the genitive case particle 'no', noun
Functions as a noun or no-adjective, often in phrases like いつもの (the usual ...) or いつも通り (as usual).
いつもの席に座った。
I sat in my usual seat.
彼はいつも通り遅れて来た。
He came late, as usual.