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连用:They asked us whether or not...
注意:只能用whether不用if 的三种情况 • 一般情况下,if 和whether可以互换,但以下3种 情况只能用whether: • ①与or not连用: He asked me whether or not I was coming. Let me know ...
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