Before starting the exercise for expressing "just" and "only" 「だけ」「しか...ない」, please clarify any doubts you may have about the grammatical rules by referring to your grammar guidebook or dictionary. The Instantaneous Composition Method requires you to compose sentences with the target sentence pattern(s) over and over in order to use them almost effortlessly. You should already have the necessary knowledge.
Instantaneous Composition Exercise for Expressing "Just" and "Only" 「だけ」「しか...ない」
This is not a translation exercise. This is the Instantaneous Composition Exercise. As if a reflexive action, try to create an equivalent Japanese sentence shortly after reading an English script. Try not to think for more than three seconds.
English and Hidden Japanese Scripts
(I) have just one day off.
休みの日が一日だけあります。
There is only me in the park.
公園に私だけがいました。
I’m the only one that did the homework.
私だけが宿題をしました。
I’m the only one that knows (the fact).
私だけが知っています。
(I’m) just looking at (that).
見ているだけです。
Kato-san is just angry.
加藤さんは怒っているだけです。
There is nothing but bad restaurants in the town.
町に不味いレストランしかありません。
There is nobody but me in the school.
学校に私しかいません。
There is nothing to do but ask the teacher (to do something).