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The function of ....

Posted by English learner on July 11, 2003

Hello,
Could you please help me to know the usage of the word "function"? Are these following sentences natural and grammatically correct? Could you list all the sentence patterns of the word 'function'? Another question: is it possible that the usage of some word, though not listed in the renowned dictionary, can be used in daily life? Thank you very much. Here are my sentences:
1. The function of this knife is to cut the fish.
2. The function of this knife is that the fish is cut.
3. The function of this knife is that it cuts the fish.