1. The superlative degree is used for the comparison of three or more things\persons or groups ( of things \persons ) are different with regard to the adjective. The superlative form is usually preceded by the.
e.g.
our house is the largest in the neighborhood.
(= larger than any other house…).
Everest is the highest mountain the world
These are the most beautiful flowers I have ever seen.
2. The positive from the adjective is used for comparison in two ways:
a. To show similarity between tow things \persons or groups ( of things \persons ). This is done by using the structure :
As+ positive adj.+ as ( in the affirmative ).
e.g.
the child is as quiet as mouse.
He is as proud as a peacock.
Oil is as valuable as gold.
She looks as fresh as daisy.
b. To show that tow things \persons or groups ( of things \persons ) are different with regard to the adjective. This is done by using the structure in (3a) above in the negative.
The first as may also be changed into so.
e.g.
his marks are not as\so high as hoped .
the hotel was not as\so comfortable as we expected .
the test was not as\so easy as the students desired.
More uses of comparative degree
a. The following pattern is used to show that degree of one quality depends upon the degree of another.
( the + comparative (1) + subject + verb + the + comparative (2) + subject + verb )>
e.g.
the better your works is, the more money you will get.
The easier the questions are, the higher marks the students will get.
The more complicated the machine is, the more difficult it becomes to repair.
b. the comparative are usually joined by and to show gradual increase or decrease,
e.g.
she is getting prettier and prettier .
the horse is becoming more and more difficult to handle.
The matter is growing less and less important .