我看不懂你的疑问在哪 只能先帮你分析一下这句话了
i是主语,have是谓语,letters是宾语（no修饰letters,应该为定语吧）,一句话有谓语动词,所以to be posted 为非谓语动词,本应为to post,但 post 与letters是被动关系,所以要加be表被动
I have no letters to be posted now.为什么后面的“to be posted” 为啥用被
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