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Quick Glossary (用語辞典)tough = かたい
progressive form = 進行形
Examples(例文)
This idiom is used to describes someone's feelings when that person becomes very, very angry. It is often used in the progressive (~ing) form .
When I met my boss after I had lost our biggest client, he was seeing red.
Exercises (練習)Type the proper form of the idiom in the box.