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they usually have spare time .这句话怎么变疑问句?

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they usually have spare time .这句话怎么变疑问句?
They usually have spare time.意为“他们通常有空闲的时间.”
一般疑问句:Do they usually have spare time?他们通常有空闲的时间吗?(问是否有)
特殊疑问句:How often do they have spare time?他们有空闲的时间是多久?(问频率)