In many such cases, a cursory search for causes finds that some small group of people was wearing, promoting, or developing whatever it is before anyone else paid attention.

　　A cursory search 是主語(yǔ)，finds是賓語(yǔ)，that后是一個(gè)賓語(yǔ)從句，在賓語(yǔ)從句中，主語(yǔ)是small group of people, 謂語(yǔ)是帶ing的三個(gè)詞，這三個(gè)詞后要接賓語(yǔ)的，所以whatever又引導(dǎo)一個(gè)賓語(yǔ)從句，在從句中，it做主語(yǔ)，is是系動(dòng)詞，whatever做表語(yǔ)。Before引導(dǎo)一個(gè)時(shí)間狀語(yǔ)從句。該句是說(shuō)在很多情況下，對(duì)原因的粗略調(diào)查顯示，在其他人注意到這一潮流之前，一些小群體早就開(kāi)始了引領(lǐng)或發(fā)展潮流的做法。

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