问题标题：
hehavenofinishedhishomework,hedoesn'tfinishhishomework,hedidn'tfinishhishomework有什么区别?
问题描述：
hehavenofinishedhishomework,hedoesn'tfinishhishomework,hedidn'tfinishhishomework有什么区别?
汪柏年回答：
没有hehavenofinishedhishomework之说,这样说是不符合语法的.可以说hehavenotfinishedhishomework.hedidn'tfinishhishomework是hedoesn'tfinishhishomework的过去式.hedidn'tfinishhishomework表示在以前发生过的对话时说明的那个时候他还没做完作业.hedoesn'tfinishhishomework现在（说话当时）还没完成作业.
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