When our country calls us for help, we can't help but go.
can't help but do 为惯用法(idiom), 记住这种固定用法即可,不必分析。
Not a day goes by but I think of dear old Larry .
but在这个句子中为关系代词,引导定语从句修饰主语a day. but引导定语从句,主句一定是否定句。but等于that...not。
Not a day does by that I don't think of dear old Lady.
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