In Which

“In which”通常用于描述事物或事件发生的范围或背景。例如：

- The book in which the story is told has become a classic.

这句话中的“in which”表示故事发生的媒介——即这本书。

For Which

“For which”常用来表达目的或原因。例如：

- The award for which he was nominated was prestigious.

这里，“for which”强调了奖项的重要性和他被提名的原因。

On Which

“On which”通常用来描述位置或者基础。例如：

- The ceremony on which awards were given took place last night.

在这个例子中，“on which”指代的是颁奖典礼的具体时间点。

At Which

“At which”往往用于特定的时间点或地点。例如：

- The meeting at which decisions were made lasted all day.

这里的“at which”明确指出了会议发生的时间段。

以上四种搭配虽然看似相似，但在实际应用中有着细微的区别。掌握这些差异不仅能够提升语法准确性，还能使语言表达更加丰富多样。希望通过对这些短语的学习，大家可以更自如地运用它们来构建复杂的句子结构。