1. Present perfect
Unit 4

2. Affirmative sentences
Pronoun + have / has past participle + complement
For example:
I have finished my homework
She has written the Science report

3. Negative sentences
Pronoun + have / has not + past participle + complement
For example:
I haven’t done my homework
She hasn’t written the Science report

4. Interrogative sentences
have / has Pronoun + past participle + complement + ?
For example:
Have you done your homework?
Has she written the Science report?

5. ALREADY We use it in affirmative sentences
We use it to express that something was done
It goes after have / has
For example:
I have already done my homework

6. Yet We use it in Negative and Interrogative sentences
We use it to express that we didn’t do something
It goes always at the end of the sentence
For example:
I haven’t done my homework yet
Has she written the Science report yet?

7. Present perfect vs Past simple
Past Simple: Something started and finished in the past
I played the guitar when I was at school
(We don’t know if she still plays the guitar in the present)
Present perfect: Something finished but it is still connected with the present.
I have worked in this bank for 5 years
(He still works at the bank)