which 用法【2種高階用法】加入in, for, on, at, from, to

前文出現過的【noun 的X】，學生常平平無奇的寫成 its X。【e.g. 體育課(Noun)的 上課時間(X)】，其實可以改成【the X of which】，增強句子前後元素的連貫性。

例:

Physical Education is a subject with less homework and its lesson time is precious moments to develop comradeship among classmates.   

改成 (增強是前面noun的「附屬感」):

Physical Education is a subject with less homework and the lesson time of which is precious moments to develop comradeship among classmates.   

(P.S.:如該名詞是【人】，甚至用【the X of whom】 也可以，可從【高階prep+which用法youtube視頻】講解中作更深了解)

prep+ which 的prep不一定是由後面搬上來，很多時是「與前面的名詞相配」，組合成collocations。