名词
中文翻译：模态助动词
同义词：
['modalverb', 'moodal verb']
例句：
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1. She is not sure aboutthe weather forecast.
她对天气预报不确定。
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2. Theteacher asked us to raise our hands ifwe knew the answer.
老师让我们举手，如果我们知道答案的话。
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3. He was nervous aboutgiving a speech in front of everyone.
他紧张地准备在所有人面前演讲。