Present Perfect Tense

The present perfect simple tense is used to talk about a past time, which has very strong meaning for the present.

Present Perfect Tense Timeline

For Example :

• The train has already left.
• We have informed to the police

(A)  Form : 

1. Affirmative : Sub + has/have + Past participle
2. Negative : Sub + has/have + not + Past participle
3. Interrogative :

• Inverse Question : Has/have + Sub + Past participle  
• Wh-Question : Wh-word + has/have + Sub + Past participle.

 Examples : 

•  She has just gone out.
• We have not finished our home work yet.
• We have not got the invitation card.
• Have you seen this film?
• Have they finished the work?
• Why have you not invited him ?
• Who has broken this window ?

(B)  Key Words : - for,Since.

       

       For : It indicates the period of time.

       Since : It indicates the point of time.

(C)  Use of Present Perfect Tense.

  1.