前半部分是定语从句还是同位语从句?The reason why he was dismissed is that hewas careless.

问题描述:

前半部分是定语从句还是同位语从句?The reason why he was dismissed is that hewas careless.
The reason (why he was dismissed )is that hewas careless.

应该是定语从句
你已经在why he was dismissed 处打括号了,省略不看,这个句子的意思仍然通顺.原因是他太粗心了.
reason这个先行词一定要用why来引导,语法书有的,你可以去查一查,加入why he was dismissed这个后置定语,意思是他被解雇的原因是因为他太粗心了.