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问题: This way the river slowly digs itself deeper into the rock surface of the Earth

deeper 有3个可能
1 是副词 修饰dig
2 是主语补语
3 是宾语补语
到底是哪个,讲解一下,我知道不必深究语法照样可以学好语言,不过我是学数学的,不搞清楚,还真他妈的不爽

解答:

This way the river slowly digs itself deeper into the rock surface of the Earth.
deeper
是副词 修饰dig。这个句子应该这样理解:This way “这样”;“以这种方式”
the river slowly digs itself deeper into the rock surface of the Earth
=the river slowly digs deeper itself into the rock surface of the Earth.