だけ
(Dake)
only / just (basic noun restriction).
Connection rules
- +Noun + だけ; Number/counter + だけ (一つだけ 'just one'). Can follow or replace case particles.
- +Neutral register — contrast with ばかり which is emphatic/critical.
- +With numbers or counters, expresses 'just X much': 一人だけ ('just one person'), 少しだけ ('just a little').
Examples
1.
水だけ飲みました。

Mizu dake nomi mashi ta.
I drank only water.
「only / just (basic noun restriction)」
2.
一人だけ来ました。

Ichi nin dake ki mashi ta.
Only one person came.
「only / just (basic noun restriction)」
Practice
Please wait for just five minutes.
___待ってください。
Romaji also accepted