英文:關於wish 與hope的不同

wish與hope都表示希望.....也都當動詞
但兩者到底差別在哪裡呢?
比如:Wish you were here.能否說成Hope you were here.

又如: I hope so. 但沒聽過I wish so.的說法

有請英文答人解惑. 感謝!
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