This document discusses the use of present perfect tense in English. It provides examples of how present perfect is used to emphasize the result of a past action without specifying time, describe an action that began in the past and continues in the present, and talk about life experiences at some undefined time in the past. The document also contrasts the use of present perfect and past simple tenses, noting that past simple is used to talk about completed actions in definite past timeframes like last week, while present perfect is used for unfinished time periods like this week.

2. Subject + Have/Has + Verb (in the past
participle form)

3. Positive Negative Interrogative
I have worked. I have not worked. Have you worked?

5. 1. To emphasize on the result of a past action
without mentioning the actual time when it
happened:
Examples:
 I have met that girl before.
 We have discussed this issue a few times.

6. 2. Action performed in a period that has not
finished yet (the same day, week, month, etc.):
Examples:
 Have you seen Lacy today? (The day is not
over yet.)
 I have had several tests this month. (The
month has not finished yet.)

7. 3. Action that started in the past and has
continued until now. Often used with since
(indicating the beginning of action) or for
(indicating the duration of action):
Examples:
 They have lived here for ten years.
 I have not seen her since we left high school.

8. 5. To talk about life experience: things
we´ve done at some time in the past.
Example:
He hasn´t travelled overseas before.

9. - Finish time ( Past Simple)
Last week, yesterday, last month, last
year.
- Unfinished time (Present perfect)
this week, today, this month, this year.

10. Last month, I visited my grandmother three
times.
This month, I have visited my grandmother
twice.
They haven´t been at school all morning.

11. Have/Has + Subject + main verb (past
participle)
Has he cleaned the bathroom?
Have you eaten enough?
Has it rained today?

12. Did you go to Thailand last year?
Have you been to Thailand?
- Time reference.