過去のモーダルの紹介:must have、 should have、 would have、および Could have
過去のモーダル: | を持つことができます。 |を持つ可能性がありますあるかもしれない | | が必要です| が必要ですあるだろう - 文法
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過去のモーダル: かもしれない、できたかもしれない、すべきだった、きっとだった、はずだった....
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