この古い建物は昔、きれいだった。

この古い建物は昔、きれいだった。

This old building has seen better days.

この古(ふる)い建物(たてもの)は昔(むかし)、きれいだった。

Kono furui tatemono wa mukashi, kirei datta.

此の (この)

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

古い (ふるい)

old (not person); aged; ancient; antiquated; stale; threadbare; outmoded; obsolete article

建物 (たてもの)

building

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

昔 (むかし)

olden days; former

綺麗 (きれい)

pretty; lovely; beautiful; fair; clean; clear; pure; tidy; neat; completely; entirely

だ (だ)

be; is; indicates past or completed action; indicates light imperative

Readings: コ、ふる.い、ふる-、 -ふる.す

Meaning: old

Readings: ケン、コン、た.てる、た.て、 -だ.て、た.つ

Meaning: build

Readings: ブツ、モツ、もの、もの-

Meanings: thing, object, matter

Readings: セキ、シャク、むかし

Meanings: once upon a time, antiquity, old times