（what） are they useful （for）?

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（what） are they useful （for）?
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（what） are they useful （for）?
（what） are they useful （for）?

（what） are they useful （for）?
他们是用来做什么的?

他们是什么有用的吗

问题补充：
用英文解释
serve, be of service to
他们对于什么是有用的?
他们有什么用?
be useful for
对…有用；具有…用途
This is a book useful for beginners in French.
这是一本对初学法语的人有帮助的书。
They are useful f...

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问题补充：
用英文解释
serve, be of service to
他们对于什么是有用的?
他们有什么用?
be useful for
对…有用；具有…用途
This is a book useful for beginners in French.
这是一本对初学法语的人有帮助的书。
They are useful for children.
它们对孩子们很有用。

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(什么)他们是有用的

are they useful = does it help

（what） are they useful （for）? What are they like?（中文） （how/what）clever boys they are what are they?（怎么回答） what are they What are they? What are they doing? what are they doing? what nice they are What are they What are they? What are they? What islands are they? what are they! what great they are! what are they are pens what colour are they可以变成what are they colour? What colours are they?与 What colour are they?