2. Present perfect tense is a grammatical combination between the present tense and perfect tense. Type tenses in English which is used for an act of activity that occurred in the past and is still in effect today.  Present Perfect tense is used when: - The action that occurs in these uncertain times prior to this time. - The action that occurred in the past and still has influence today -The action that began in the past and is still continuing today

3. To form sentences Present Perfect (simple) tense we need to know about: Form auxiliary used in the present perfect tense is "to have". Present perfect composed of subject, auxiliary have / has, and the past participle. Auxiliary Verb is divided in two forms: For example - I have eaten some food - You have gone to school Singularplural I have You have He She It has We have You have They have

4. (+) Positive - Subject + has / have + been + object - Subject + has / have + Verb3 + object example: - You have seen that movie many times - There have been many Earthquakes in California

5. (-) Negative - Subject + has / have + not + been + object - Subject + has / have + not + verb3 + object example: - People have not Traveled to the moon - He has not been here since morning

6. (?) Interrogative - Have / has + Subject + verb3 + object - Have / has been + + subject + object example: - Have you read the book? - Has there ever been a war in the United States? some functions Present Perfect Tense

7. THANK YOU