CAN:  be able to + verb  She will be able to do it tomorrow.  They were not able to come.  Will you be able to bring it next week?   MUST: have to + verb  We will not have to go there.  I had to buy new curtains.  Did you have to go there?   MAY: be allowed to + verb  We are allowed to stay out until 8 p.m.  Will we be allowed to go to the cinema?  They were not allowed to buy anything.  Note:  These expressions can be also used in the present tense.  I am able to win the tournament.  Is he allowed to buy a dog?  You have to send the letter today.
   An adjective usually describes a noun or pronoun and it is used either  before a noun or after a lining verb. Examples: Big, small, beautiful,  interesting etc.   Qualitative adjectives provide information about the qualities of something or someone. So:    These adjectives identify a quality that a person, an animal or a thing  has; large, small, beautiful etc. For examples: Tall boy, big dog, long  letter etc.     qualitative : good, bad, happy, blue, French     Because qualitative adjectives describe qualities, you can have more or less of the qualities they refer to.   He’s an intelligent  man.   I saw a  large red  car outside their house.   There was a long hairy  caterpillar on the leaf.  classifying adjectives .   These adjectives place a noun in a particular class that it belongs to.  These adjectives are words like ancient, modern, golden, silver etc.  classifying adjective  - an adjective that classifies its noun (e.g., `a nervous disease' or `a mu...