I hated the assignments to turn out long , lifeless paragraphs that were agony for teachers to read and for me to write.
我痛恨那些冗长乏味的段落写作，老师读起来受累，我写起来痛苦。

注释：本句主干为：I hated the assignments..。其中 to turn out long , lifeless paragraphs 作 assignments 的后置定语，定语从句 that were agony for teachers to read and for me to write.的先行词为 paragraphs 。

to turn out long , lifeless paragraphs 作 assignments 为什么是作后置定语？怎么理解

to turn out...为不定式作定语，修饰assignments这个名词。

不定式作定语时通常跟随在其修饰的名词之后，主要见于以下几种情况：

1、不定式作定语与其修饰的名词或代词构成逻辑上的主谓关系，此结构相当于一个被简化的定语从句，目的在于描述逻辑主语的某种特性，问题中的“assignments to turn out...”即属于此类，“to turn out”的作用等同于“which turn out...”。
[e.g.] China has promised to behave as a responsible nation to help stablize the unrest world economy. (= China has promised to behave as a responsible nation which helps stablize the unrest world economy.)

2、不定式作定语与其修饰的名词或代词构成逻辑上的动宾关系：
此结构中被修饰的词作逻辑宾语，不定式的作用在于描述对被修饰对象将做未做的某种动作。
[e.g.] You might have many questions to ask after my introduction.

3、不定式作定语与其修饰的名词或代词构成同位语关系：
此结构中不定式的作用在于说明被修饰对象的具体含义或内容。
[e.g.] He has made a wish to travel around the world when he grows up.