动词ing开头为什么要用has 比如working at home has some advantages.
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从英语语法理论上讲,动名词(即动词的ing形式)作主语算第三人称单数.如果谓语是有或完成之类就用has.

如:Playing football is my hobby.

Planning so far ahead has some disadvantages.

have当"有"讲,主语是第三人称单数用has,其他人称、数均用have.

have用于完成时也是如此.

如:I have a brother,but my wife hasn't.

I have been to Beijing twice,but she hasn't.

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