看是便一般疑问句还是对某一部分提问了
原句翻译是
1.they have some friends who often wear blue jeans
2.some of their friends sometimes wear blue jeans
一般疑问句是
1.Do they have some friends who often wear blue jeans?
2.Do some of their friends sometimes wear blue jeans?
问穿什么是
What do their friends sometimes wear?
问颜色是
What color is their friends' jeans?