This pattern comes from classical Japanese and means 'like', 'as if', or 'the same as'. It is not used in everyday conversation; it appears in formal writing, speeches, and literary contexts. The three forms are: ごとし ends a sentence (like ようだ), ごとく modifies verbs/adjectives (like ように), and ごとき modifies nouns (like ような). For example, 彼は風のごとく去った means 'He left like the wind.' The noun form requires の: 花のごとき君 means 'a girl like a flower.' When using with verbs, attach directly to the dictionary form: 彼は言うごとく行動する means 'He acts as he says.' This pattern is highly formal; using it in casual speech sounds archaic or pretentious.