解释为是否时,用法同wether；
就是看句意,文中指的是什么时候就用什么时态.
E.g.:I dont't if he has passed exam.（像这个就是完成时）
（也可以用wether,前后时态要统一.）
英语翻译if he comes back tomorrow please let me know 这个句子这么做对不对
2个回答
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