go is Harbin when time the best to to 怎么连成英语?

问题描述:

go is Harbin when time the best to to 怎么连成英语?

同意三楼的观点,“when is the best time to go to Harbin?” (主系表结构)这句话表面上看似乎没有错误.
when 作为副词 是不能作为宾语的(本句中主语是the best time ,宾语是when)
同意when 更改为 what.