Language theory
20.1 Introduction
We all use natural language to communicate. In a natural language, there is no strictly formal way of deciding exactly what is or is not an acceptable sentence. This is because natural language is constantly evolving and subject to cultural diversities. The meaning of a sentence in a natural language is yet another problem. A sentence may have different meanings in different parts of the world or because of ambiguities arising from its structure. If I say ‘I locked my car keys in my boot’ in England I have accidentally left my car keys in the boot (trunk) of my car. In America I have cleverly forced them into a lockable shoe. If I say ‘Green fields like a wet blanket’ I could be making a poetic reference to the ...
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