フレーズ · 🎲 Speculating & hedging

A essa altura, eles já devem ter chegado.

By now they must have arrived.

B2speculating about the past音声・近日公開

それぞれの単語がその位置にある理由

A前置詞to, atessa限定詞this, thatesse · 女性 · 単数altura1名詞point, height (a essa altura = by now)女性 · 単数,eles代名詞they, themele · 3人称複数já副詞alreadydevem2動詞mustdever · 現在 · 3人称複数ter2動詞to have不定詞chegado動詞arrivedchegar · 過去分詞 · 男性 · 単数.

eles → devem: 3rd plural
ter → chegado: compound infinitive

この形になる理由

注の番号は上の番号に対応しています。

1
A essa altura = by now, at this point. Compound future & conditional: speculation and allegation →
2
devem ter chegado: plural dever + ter + participle. Compound future & conditional: speculation and allegation →