My watch doesn't work well.I don't know the reason.(合并为一句)
问题描述：
My watch doesn't work well.I don't know the reason.(合并为一句)
I don't know --------- my watch doesn't work well.
答
the reason why只能填一个词呀那就填 why就可以了 表示原因要用why 直接填why 这是个宾语从句可以直接用why吗，老师说不能啊，答案给的是that，我不明白可以啊 why 可以引导宾语从句 I don't know why he broke off in the middle of a sentence.我不知道他为什么说到半中腰就停止了。