基本上没错,但是 英语国家的人习惯主语一致.
也就是说 从句的从句基本和主句的主语保持一致,如果不一致就用独立主格结构.
可以这样写：
lf you not knowing how to look up a word in a dictionary,the dictionary is useless.
lf you don't know how to look up a word in a dictionary,the
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