……….1. Depends on sufficient exposure to the language. ……….2. Requires a lot of instruction. ……….3. Is uniform through the human race. ……….4. Is similar to the learning of arithmetic ……….5. May end in failure ……….6. Can be acquired only by human beings ……….7. Is a very slow process because of its complexity ……….8. Is mastered only by adults for practical purposes ……….9. Is learned by a child more quickly if the parents act as tutors