一个英语句子 主语的疑问
问题描述：
一个英语句子 主语的疑问
what the teacher had wortten on the board {were}keys to the problem括号里的为什么是{WERE而不是 WAS
答
关键词汇是KEYS,因此需要用为were,而不是was.
如果将句子改一下,就变为：
There were keys to the problem on the board written by the teacher.
如果句子为：
what the teacher had wortten on the board {was}a key to the problem.
这里就要用was,而不是were.