中科新闻网大长今美肤美颜家族:英语语法词形转换
来源：百度文库 编辑：中科新闻网 时间：2024/05/14 02:08:29
They could not find any secrets。=They（ ）not （ ）to find any secrets 。
为什么第一个空不用was？
为什么第一个空不用was？
第一个空填were，第二个空填able
be able to do 相当于can/could，表示有能力的意思。有多种时态变化。
were和are都是用于复数名词之后。they\we\you等都属于复数人称代词，所以要用were或是are
They were not able to find any secrets.
They were not able to find any secrets.be able to do意为有能力做某事
They were not able to find any secrets.
They的后面要接复数,怎么能接was呢?