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句子主語(yǔ)是One of the many fears，謂語(yǔ)是is，is后面的that they will reduce the time people spend with each other為表語(yǔ)從句。　　

另外，主語(yǔ)后面的expressed about computers and the internet為過(guò)去分詞短語(yǔ)，作定語(yǔ)，修飾fears。expressed about computers and the internet可視為which were expressed about computers and the internet這一定語(yǔ)從句的省略形式。其中的express為及物動(dòng)詞，它在句中用了過(guò)去分詞形式，表示被動(dòng)意義，expressed about 可理解為expressed fears about…