以下3句都对:
This is my own bike. (own 是形容词,作定语)
This is a bike of my own. (own 是代词,具有名词性质,作介宾)
以上两句表达相同意思。可以灵活换用。
This bike is my own. (own 是代词,具有名词性质,作表语)
Lend him your bike. His own is broken. (own 是代词,有名词性质,作主语)
Lend him your bike. He can't find his own. (own 是代词,有名词性质,作宾语)
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