まるで〜ようだ
just like, as if
まるで + Noun の / Plain form + ようだ / みたいだ
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まるで strengthens a comparison: "just like, exactly as if". まるで夢のようだ, "it's just like a dream".
It sets up the end of the sentence, which is almost always ようだ, ような, ように or みたいだ. The comparison is usually to something it isn't really: 彼はまるで子どものように泣いた, "he cried just like a child".
It's vivid and descriptive, common in stories and when expressing strong impressions: 今日はまるで夏のような暑さだ, "it's as hot as summer today".
In grammar questions, spotting まるで at the start tells you the sentence will end with ようだ or みたいだ.
Examples
まるで夢のようだ。
It's just like a dream.
彼はまるで子どものように泣いた。
He cried just like a child.
今日はまるで夏のような暑さだ。
It's as hot as summer today.
彼女は日本語が上手で、まるで日本人みたいだ。
Her Japanese is so good, it's as if she were Japanese.
部屋はまるで誰も住んでいないように静かだった。
The room was so quiet it was as if no one lived there.