问题补充：
Her friend helped her 怎么改成一般疑问句还有三句：A bird flew in the sky（改为一般疑问句）I spent three hours in the science museum（改为一般疑问句）He wanted to go into space（改为一般疑问句）
答案：
Her friend helped her 怎么改成一般疑问句
Did her friend help her?
A bird flew in the sky（改为一般疑问句）
Did a bird fly in the sky?
I spent three hours in the science museum（改为一般疑问句）
Did you spend three hours in the science museum?
He wanted to go into space（改为一般疑问句）
Did he want to go into space?
======以下答案可供参考======
供参考答案1:
Her friend helped her
Did her friend help her?
A bird flew in the sky（改为一般疑问句）
Did a bird fly in the sky?
I spent three hours in the science museum（改为一般疑问句）
Did you spend three hours in the science museum?
He wanted to go into space（改为一般疑问句）
Did he want to go into space?
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供参考答案2:
Did her friend help her?
Did a bird fly in the sky?
Did you spend three hours in the science museum?
Did he want to go into space?
