I want to leave tomorrow.前为啥不用介词?I want to leave tomorrow morning.

I want to leave tomorrow.前为啥不用介词?I want to leave tomorrow morning.
I want to leave tomorrow.前为啥不用介词?I want to leave tomorrow morning.

I want to leave tomorrow.前为啥不用介词?I want to leave tomorrow morning.
tomorrow和yesterday这些词是直接做时间状语,包括last/next后加表示时间的名词,如day,year等等这些词,还有this morning/afternoon/evening这些词组等等,前面是不加任何介词的.后面那一句也没有什么语法错误..

tomorrow之前是不需要介词的，类似于固定搭配，today也是，就像I want to go home一样，home前也是不用加介词的.另外你的句子是正确的。