PRESENT PERFECT

1. AFFIRMATIVE

1.1. Subject + HAVE/HAS + Past Participle

1.1.1. I have worked

1.1.1.1. You have worked

1.1.1.1.1. He/she/it has worked

2. NEGATIVE

2.1. Subject + HAVEN'T/HASN'T + Past Participle

2.1.1. I haven’t worked

2.1.1.1. You haven't worked

2.1.1.1.1. He/she/it hasn't worked

3. INTERROGATIVE

3.1. HAVE/ HAS + Subject + Past Participle

3.1.1. Have I worked?

3.1.1.1. Have you worked?

3.1.1.1.1. Has he/she/it worked?

4. SHORT ANSWERS

4.1. Yes + subject pronoun + HAVE/HAS

4.1.1. Yes, I/you/we/they have

4.1.1.1. Yes, he/she/it has

4.2. No + subject pronoun + HAVEN'T/HASN'T

4.2.1. No, I/you/we/they haven't

4.2.1.1. No, he/she/it hasn't

5. PRESENT PERFECT

5.1. BEEN

5.1.1. I've been to London = I'm back

5.2. GONE

5.2.1. She's gone to Paris = she's there

6. PRESENT PERFECT

6.1. EVER

6.1.1. INTERROGATIVE

6.1.1.1. Have you ever lost something important?

6.2. NEVER

6.2.1. NEGATIVE

6.2.1.1. I've never gone on a cruise

7. PREESTN PERFECT VS PAST SIMPLE

7.1. PAST SIMPLE

7.1.1. Actions finished in the past

7.1.1.1. I went to London last summer

7.2. PRESENT PERFECT

7.2.1. Actions happened in an indefinite time

7.2.1.1. I've been to London