How often do they have ball games?的句意为：他们多久进行一次球赛?
这是一个一般疑问句,
how often 是两个词组成的相当于疑问复词的词组,用于问频率（多久一次）,
do是疑问助词.
How often do they have ball games?介绍一下语法特点.
5个回答
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