He makes as though he didn't hear.请问这句话是不是有语法错误啊?为什么前面是 makes 后面是 didn't

没有.as though是关键.as though就是当作...的意思.后面必须是过去式的.举个例子： as if 的用法
She spoke to me as if she knew me.她和我说话的神色,好像早就认识我了.
这句话后面也是也是必须是过去式的.注：as if 的意思是 好像