(1) Is it an interesting novel? I don’t know. I don’t know if /whether it is an interesting. (2) Does Cathy go to school early? Do you know? Do you know if /whether Cathy goes to school early? 注意:只能用whether而不用if的三种情况如下: ①与or not...
1. I'll see whether or not I can persuade him to accept it. 我会试试看能不能说服他接受这一点。 2. He seriously debated whether or not he should charge his tenants extra for the water. 他认真地考虑该不该向房客们收取额外的水费。 3. He could not decid...
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