答案如下：
1、Some people are hardly ever tired,are they?
2、She's outgoing and confident.[outgoing and confident 下划线](对划线部分提问）
What is she like?
3、He wants to be an artist instead of a singer.(改为同义句）
He wants to be an artist rather than a singer.
4、People believe that UFO does exist.(用it开头改写句子）
It is believed that UFO does exist.
5、Theyboth like playing volleyball very much.(改为同义句）
Both of them like playing volleyball very much.
6、Why don't you go to the West Lake for your vacation?(改为同义句）
Why not go to the West Lake for your vacation?
7、Ben is going to the West Lake next week.(改为同义句）
Ben is travelling to the West Lake next week.
8、Linda usually goes to school by subway.(改为同义句）
Linda usually takes the subway to school.