These signs are not very difficult to see them.为什么去掉them
问题描述：
These signs are not very difficult to see them.为什么去掉them
答
them 即指These signs ，如果再要就重复了，所以去的。
句意是：这些标牌很难看见。
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答
These signs are not very difficult to see.就正确的句子来看,句子的结构已经非常完整了,these signs 是句子的主语,see是动词,可以试图将句子改写为：It is not very difficult to see these signs.就很明显看到the...