He carride his bed on to the roof. 这样提问对不对：where did he carr

on to=onto 都表示在什么之上,到什么之上,就是个介词,后面接个介词宾语.
我们就用live来举例子,live 是不及物动词,居住 的意思.
住在哪里用 live in + 地点
现在看这两句话
whcih city do you live in?这里是带了介词的,因为的which city是对in 后面的地点名词提问的.
再看这句
where do you live?这里就没有介词,因为where 是地点状语,”in + 地点“也是地点状语.
所以where里面就包括了介词in,这里动词后面就不能再有in了.
Where do you live?I live (in) Beijing,China.
正解是：Where did he carry his bed?

where是疑问副词，不需要加on或者to~你只要这么问就可以了：Where did he carry his bed?

用疑问副词Where提问的话，是要具体的地点，且是对on to the roof提问，问句为Where did he carry his bed?而且这样的提问不太确切，
因为on to place不是一个地点这么简单，on to连用有一个动作的含义。

比较好的提问方式是Which place did he carry his bed on to?

...

Where did he carry his bed to?这样提问完全正确！