形容词用法
The hardrocks are difficult to break. (坚硬的石头很难打破。)
She finds math problems hardto solve. (她觉得数学题很难解。)
副词用法
They worked hardall day. (他们整天努力工作。)
It was hardto breathe in the smoke. (在烟雾中呼吸很困难。)
比较级
This book is harderthan that one. (这本书比那本书难。)
She works harderwhen she knows the stakes are high. (当知道风险高时,她工作得更努力。)
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