The first texbook ____ for teaching english as a foreign language came out in the 16th century.

题目

The first texbook ____ for teaching english as a foreign language came out in the 16th century.
空处的答案是written,解析说因为texbook与written是被动关系,但是被动语态不是要在BE动词前面加BE的吗?这里为什么不用?

答案

written write的过去分词,确实是常用法前面要加上BE,但是这这种句式中written是过去分词短语做形容词用,此断句也是主语first texbook 对应后面加上一个修饰短语 wriiten for teaching english因此中间不用bePS 也许...