IF引导的宾语从句的时态怎么用那回答怎么说

如题所述

if引导的宾语从句的时态根据从句中的时间或及物动词谓语时态决定的。
I don't know if/whether he will come.
He didn't know if/whether the teacher had arrived.
引导宾语从句时if=whether
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