NL has an extremely rich form and structure.
It is very ambiguous. There can be different levels of ambiguity −
● Lexical ambiguity − It is at very primitive level such as word-level.
● For example, treating the word “board” as noun or verb?
● Syntax Level ambiguity − A sentence can be parsed in different ways.
● For example, “He lifted the beetle with red cap.” − Did he use cap to lift the beetle or he lifted a beetle that had red cap?
● Referential ambiguity − Referring to something using pronouns. For example, Rima went to Gauri. She said, “I am tired.” − Exactly who is tired?
● One input can mean different meanings.
● Many inputs can mean the same thing.