Apply は・が・を・の in real sentences. Kana only, using words and patterns you've already learned — pick the particle that fits. The meaning lives in the sentence, not a definition.

• これ＿ねこです。はThis is a cat.
• パン＿たべます。をI eat bread.
• みず＿のみます。をI drink water.
• へや＿ねこ＿います。がThere is a cat in the room.
• はは＿ねこ です。の(It's) my mother's cat.
• にく＿たべます。をI eat meat.
• いぬ＿みずをのみます。がThe dog drinks water.
• それ＿コーヒーですか。はIs that coffee?
• ちち＿がっこう＿いきます。へMy father goes to school.
• つくえ＿うえ＿ほんがあります。のThere is a book on the desk.
• さかな＿たべます。をI eat fish.
• これ＿ちち＿くるまです。はThis is my father's car.
• とり＿います。がThere is a bird.
• ねこ＿みずをのみます。はAs for the cat, it drinks water.