PRESENT PERFECT

Present perfect is the form of the verb used for actions or events that have been completed or have happened in a period of time up to now.

Subject + "have/has (not)" + Verb3 + Object

1. How Long? (since, for)

    Example:

    a. I have known Auliya since 1994.

    b. She has lived in Jakarta for 3 years.

    c. I have thought about it for two hours.

    d. You have been sick since last week.

    e. I haven't been quite myself since the accident.

2. Life Experience (never, ever, before)

    Example:

    a. I have been to Malaysia.

    b. She has never studied to Japanese.

    c. I have been to Singapure three time.

    d. He has never travelled by train.

    e. Hasan has studied 2 foreign languages.

3. Unfinished Time Word (this month, this week, today, in the today, frequently, already)

    Example:

    a. She has had lunch today.

    b. We have seen Surya this week.

    c. I have worked hard this week.

    d. It has rained a lot this year.

    e. We haven't seen him today.

4. Present Result

    Example:

    a. I have lost my keys!

    b. Raihan has missed the bus, so he'll be late.

    c. Have you just finished work?

    d. I have just eaten.

    e. We have just seen her.

Source : Aplication 12 Tenses, English Grammar