Where ,have,lunch,his,mother(?) (用现在进行时连词组句)(Where is his mother having lunch?)知道是这样写,但不知为什么在Where后面用is

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Where ,have,lunch,his,mother(?) (用现在进行时连词组句)(Where is his mother having lunch?)知道是这样写,但不知为什么在Where后面用is
Where ,have,lunch,his,mother(?) (用现在进行时连词组句)
(Where is his mother having lunch?)知道是这样写,但不知为什么在Where后面用is

Where ,have,lunch,his,mother(?) (用现在进行时连词组句)(Where is his mother having lunch?)知道是这样写,但不知为什么在Where后面用is
用一般现在进行时的行式就是这样his mother is having lunch.然后提问的是是在哪儿,所以把where 提前也就是
疑问词+be动词/助动词/情态动词/+主语

现在进行时规定在现在分词的前面要有助动词is,am,are,这句是疑问句,所以要求助动词is要提到主语his mother 的前面。

Where is his mother having lunch?