What are the three major sources of homonyms? Match with the fol

What are the three major sources of homonyms? Match with the following example words: rock, ball ear.
【正确答案】：Homonyms fall into three classes: perfect homonyms,homographs and homophones.rock, ball, ear are perfect homonyms.(同音词分为三类:完全同音词、同形词和同音词。摇滚、球、耳朵是完美的谐音。)