第一句：we must none of us go alone until we get to the sea.---源自于《金银岛》

第二局：in other words, you fear a mutiny, "I did not say that sir", replied Captain, "no captain could go to sea believing that". and he went away.---源自于《金银岛》

以上的句子学生有些地方不太明白：第一句中的none of us是修饰go的吗？而且这句话的主语是we,所以none of us应该不是主语，第二句中的believing that 是分词引导的条件状语对吧！谢谢！