副词可以作很多成分：状语、表语、定语、宾补、介宾
状语：He walked *slowly*.
表语：The light is *on*.(此处on不是介词,on the desk里的on是介词.)
定语：The students *here* are all good at computer.
宾补：Call him *back* please.
介宾：I recognized him from *upstairs*.我在楼上就认出他了.
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