“穿凿附会的、难以置信的或牵强”用英语表达可以是 far-fetched，寓意：
1、unlikely to be true 不太可能是真的
2、totally bizarre 真奇怪
3、to considered false or untrue 被认为是虚假的或不真实的
4、to be remotely or slightly connected to something
与某物遥远地或轻微地相连
例如：
1、When he told us the stories of his youth, everyone could agree that they were far-fetched.
当他给我们讲他年轻时候的故事时，每个人都统一认为这些故事是牵强的。
解析：tell sb sth 是双宾语结构，相当于 tell sth to sb，在这里是 tell the stories of his youth to us.
2、Her account of the fight seems far-fetched.
她对那场战斗的叙述似乎令人难以置信的。
3、Linda has a very active imagination and that is why all her stories seem a bit far-fetched.
琳达的想象力非常活跃，这就是为什么她所有的故事都显得有些难以置信。
解析：
a、连接副词 why 引导的表语从句，在从句中作状语。
b、a bit 和 a little 在肯定句中修饰动词、形容词、副词和比较级时可以互换，表示"一点儿"的意思。
4、The girl walked away in disgust after listening to his far-fetched tales of all his love conquests.
女孩听了他那些牵强附会的爱情故事后，厌恶地走开了。
解析：after 引导的时间状语从句，从句的主语和主句的主语都是 the girl，可以省略从句的主语和 be 动词。其实省略是为了简洁，但简介不一定易懂，这就是语法的精妙之处。
5、Most people tell far-fetched stories just to inflate their egos and to feel important.
大多数人讲一些牵强的故事只是为了膨胀他们的自尊心，让自己觉得很重要。
6、I don't know why people don't just tell the truth rather than telling far-fetched stories.
我不知道为什么人们不说真话而讲穿凿附会的故事。
解析：这里的 rather than 当介词用，相当于 instead of.
7、The sailor held everyone captive with far-fetched tales of his adventures at sea.
那个水手用他在海上的难以置信的冒险故事把每个人都俘虏了。