I don't think he can finish the on time,can't he?修改病句,顺便解释下为什么,

问题描述:

I don't think he can finish the on time,can't he?修改病句,顺便解释下为什么,

I don't think he can finish the task on time,can he?
前否后肯,前面是否定前移:我觉得他不能按时完成任务,是吗?