作业帮自学英语求解答.He has to be home before six o'clock.be在这里的用法和作用?
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自学英语求解答.He has to be home before six o'clock.be在这里的用法和作用?
e是have to所带的动词不定式,与have to一起构成谓语.
更上一层楼.
不明白的欢迎再问.
再问： 请容许我问一个愚蠢的问题，为什么一定要加一个be来构成谓语？have to 不能单独构成吗？
再答： have to相当于一个情态动词，我们知道，情态动词是不能单独作谓语的，后面必须加一个动词原形后才能构成谓语。而home是副词，也不能作谓语，所以要加be动词。be强调的是状态，如果要强调动作，则可在have to后面加go：He has to go home before six o'clock.
更上一层楼.
不明白的欢迎再问.
再问： 请容许我问一个愚蠢的问题，为什么一定要加一个be来构成谓语？have to 不能单独构成吗？
再答： have to相当于一个情态动词，我们知道，情态动词是不能单独作谓语的，后面必须加一个动词原形后才能构成谓语。而home是副词，也不能作谓语，所以要加be动词。be强调的是状态，如果要强调动作，则可在have to后面加go：He has to go home before six o'clock.
自学英语求解答.He has to be home before six o'clock.be在这里的用法和作用?
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