the first textbook written for teaching english as a foreign language came out in the 16th century.

the first textbook written for teaching english as a foreign language came out in the 16th century.

题目
the first textbook written for teaching english as a foreign language came out in the 16th century.
为什么teach 要用动名词啊?还有为什么用 written for
答案
the first textbook written (被写的= which was written)for(表示目的,为了) teaching(动词作定语,修饰English,意思为教学的) English as(当做) a foreign language came out in the 16th century
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