i don't know can i finish it when i go to school 语法对吗

问题描述:

i don't know can i finish it when i go to school 语法对吗

不对,因为I don't know 后面的句子应为宾语从句,而宾语从句应为主谓结构,但本句的can I则不是,并且也没有引导词,故此句是错误的.
应该为 I don't know if I can finish it when I go to school (句意为:我不知道在我去上学时能否完成它)