Present perfect tense

  

Present perfect tense is a verb form used to express an action or situation that has started in the past and has been completed at a specific time in the past or still continues today.

Examples:

I have seen that man twenty times.

I think I have met her once before.

There have been many flood in jakarta.

People have traveled to the Moon.

Have you read the book yet?

Nobody has ever climbed that mountain.

Affirmative form
Iyou               have   worked   we     they
he/she/it    has worked /-s/
watch - watched /-ed/play - played /-ed/study - studied /-ed/
Example :- They have watched this film- He has been in New York many times- We have had five tests so far this semester

Negative form
Iyou      HAVE NOT /haven't/we           WORKED    they
he/she/it    HAS NOT              /hasn't / WORKED
1. They haven't been to New York yet.
2. She hasn't seen him so far.
- They have never been abroad- He hasn’t left

Interrogative form
                 IHAVE       you       WORKED?                 we                 they
HAS   he/she/it    WORKED?
Example : 1. Have you ever worked from home?
2. Has he ever been to Italy?


Problem : sometimes forget the use of Present perfect tense