The comparative form of adjectives is used to compared two things. However the superlative form of adjectives is used when one thing is compared to a group of three or more things.
There are some rules we should pay attention to in comparison ofct adjectives.
They are as follows :
1.      On or two syllables adjective is used with er-in the comparatives and-est in the superlative.
 Positive 
 | 
Comparative 
 | 
Superlative 
 | 
Cold 
Old 
Hard 
Pretty 
Happy 
High 
Hot 
 | 
Colder 
Older 
Harder 
Prettier 
Happier 
Higher 
Hotter 
 | 
Coldest 
Oldest 
Hardest 
Prettiest 
Happiest 
Highest 
Hottest 
 | 
2.      When adjectives have three or more syllables, the comparative is formed with more and superlative is formed with most.
Positive 
 | 
Comparative 
 | 
Superlative 
 | 
Beautiful 
Expensive 
Delicious 
Interesting 
Comfortable 
 | 
More Beautiful 
More Expensive 
More Delicious 
More Interesting 
More Comfortable 
 | 
Most Beautiful 
Most Expensive 
Most Delicious 
Most Interesting 
Most Comfortable 
 | 
3.      Irregular forms of adjectives are as follows :
Positive 
 | 
Comparative 
 | 
Superlative 
 | 
Good 
Bad 
Old 
Many/Much 
Far 
 | 
Better 
Worse 
Order/Elder 
More 
Farther/Further 
 | 
Best 
Worst 
Oldest/Eldest 
Most 
Farthest/Furthest 
 | 
Examples :
~ Today is hotter than yesterday.
~ Mount Everest is the highest mountain in the world.
~ Desy is more beautiful than Alicia.
~ Mirna is the most beautiful student in my class.
2. Expenssions of Requests
Request are commonly used to ask someone to do something.
The Patterns :
a. Modals (will,can,could,would) + you + V1
b. Do you mind if + S + V1
    Would you mind if + S + V2
    I wonder if you could . . . .
Examples :
·         Will you open the door, please ?
·         Can tou speak a little more slowly ?
·         Could you tell me the way to the hospital ?
·         Would you please meet me at 7 tonight ?
·         Do you mind staying here a moment ?
·         Would you mind waiting outside ?
·         Do you mind if I smoke here ?
·         Would you mind if I wore a sweater ?
·         I wonder if you could help me do this assigment.
3. Expensive of Obligations
a. Positive obligations
    S + must + V1
    Example :
·         You must dead now.
·         I must save my money.
S + have/has to +  V1
Example :
·         You have to come on time
·         he has to meet the manager at 6 a.m
S + need to + V1
Example :
·         I need to visit the land slide victims
·         he needs to look at the map
b. Negative Obligation
    S + must not  + V1
    Example :
·         You must not smoke here
c. No Obligation
    S + don`t have to + V1
    Example :
·         You don`t have to go to school because it`s a holiday
    
S + don`t need to + V1
Example :
·         You don`t need to do it
d. Past Obligation
    S + had to + V1
    Example :
·         I had to take part in the meeting last night
 
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