Present perfect tense

Equality negative and positive comparative

a) more than

1) London is more expensive than perish.

b) as

1) London is as expensive as new york.

c) less than

1) Paris is less expensive than London.

Comparative and superlative form

a) comparative form

cold                 colder
good                 better
likable            more likable
dirty                 dirtier
bad                   worse
far                    further
hard                 harder
difficult           more difficult

b) superlative form

taste                  the tastiest
beautiful            the most beautiful
good                  the best
higher                the highest
noisy                 the worst
large                  the largest
bad                    the worst
               

Present perfect tense

We use the Present Perfect to say that an action happened at an unspecified time before now.

Has or have with past participle

a) Positive form

1) I have paid.
2) You have forgotten.
3) She had left.
4) He has arrived.
5) It is finished.
6) We have won the match.
7) You are understood.
8) They have changed.

b) negative form

1) I have not found it.
2) He has sent it.

c) question form

1) Have you eaten?
2) Has she moved?

When use present perfect tense

We use present perfect by use of word Jeany.

J            Just          I have just seen him.
E          ever                Have you ever been to India.
A          already           I have already seen it.
N         Never             I have Never been to India.
Y          Yet              I have not Eaten yet.

1) I have just come.
2) Have ever been there.
3) He has already seen them.
4) I have never seen them.
5) I have not finished yet.