I don,t know if your father__________(comes back/will come back)

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I don,t know if your father__________(comes back/will come back)

will come back
句中if做连词,意思是是否,主句一般现在时,从句无时态限制,根据意思用将来时
注:当if解释为如果时,有特征“主将从现”

will come back主将从现
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will come back
注:IF 是否,根据句意还没回来,故用一般将来时

will come back

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