They want to learn to cook in summer holiday.对画线部分提问.

问题描述:

They want to learn to cook in summer holiday.对画线部分提问.
画线的地方是in summer holiday
When do they want to learn to cook?
而且they是复数,为什么用is而不用are?
详细下明天月考,

你好,很高兴能够在这里回答你的问题,这道题的正确答案应该为:
When do they want to learn to cook?
因为句子有实意动词want,所以不能再使用be动词
另外原句并没有出现be 动词,自然疑问句也不能额外添加be动词