一人（ひとり）だけです。

汚（きたな）いだけだった。

それだけです。

サッカーだけが好（す）き。

私（わたし）だけ行（い）きます。

その映画（えいが）は長（なが）いだけ。

彼女（かのじょ）は綺麗（きれい）なだけ。

友達（ともだち）だけ来（き）ます。

私（わたし）だけ本（ほん）を読（よ）むのが好（す）き。

バスだけで行（い）く。

妹（いもうと）はパンだけ食（た）べます。

日本語（にほんご）を勉強（べんきょう）するのは、月曜日（げつようび）だけです。

Indicating that's all there is using 「だけ」

<div class='writeup-body'>だけ is used in Japanese in a similar way to 'only' or 'just' in English. The basic meaning of this word is that 'while there are/were several possibilities, only (A) is true/was chosen'. だけ is used by attaching it to the base (dictionary) form of any word, except for な-Adjectives, which require な when being used adjectivally.<ul class='writeup-examples--holder'><li class='writeup-example'><div class='writeup-example--japanese'>今夜（こんや）は食（た）べるだけ、何（なに）も飲（の）まない。</div><div class='writeup-example--english'>Tonight I'm only going to eat, I won't drink anything.</div></li><li class='writeup-example'><div class='writeup-example--japanese'>私（わたし）はブロッコリーだけがきらい。</div><div class='writeup-example--english'>I only dislike broccoli.</div></li><li class='writeup-example'><div class='writeup-example--japanese'>あの人（ひと）は有名（ゆうめい）なだけ。</div><div class='writeup-example--english'>That person is just famous. (Fame is all they have)</div></li><li class='writeup-example'><div class='writeup-example--japanese'>このスープは辛（から）いだけ。</div><div class='writeup-example--english'>This soup is just spicy.</div></li></ul>Due to な-Adjectives being able to be used as either a noun or an adjective, the meaning of a sentence will be different depending on whether だけ is used with the noun form, or the adjective form.<ul class='writeup-examples--holder'><li class='writeup-example'><div class='writeup-example--japanese'>私（わたし）の彼女（かのじょ）は綺麗（きれい）なだけです。</div><div class='writeup-example--english'>My girlfriend is just beautiful. (There are no other distinguishing features)</div></li><li class='writeup-example'><div class='writeup-example--japanese'> 富士山は綺麗（きれい）だけじゃない。</div><div class='writeup-example--english'>As for Mt. Fuji, beauty is not all there is. (There are other distinguishing features)</div></li></ul>Basically this difference just highlights whether something is being discussed in a measurable way (an adjective), or an immeasurable way (a noun).</div>

Grammar Info

だけ

Only, Just