What is the difference between a free root and a bound root?

What is the difference between a free root and a bound root?
【正确答案】：Free roots are free momphemes which have complete meanines in themselves and can be used as free grammmatical units in sentences A bound root is the part of the word that carries the fundamental meaning just like a free root. Unlike a free root. it is a bound form and has to combine with other morphemes to make words.