这里的could 不表示过去,而表示语气的委婉,因此,用you are
I really don't know if she (will find) it when she (arrives).
if在这里引导宾语从句意为：是否．在宾语从句中包含一个时间状语从句
when引导时间状语从句．在含有条件状语从句和时间状语从句的复合句中,如果主语用一般将来时（will find）,从句用一般现在 时（arrives）
1.Could you tell me___who you are waiting for____?
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