Present Perfect Tense

Present Perfect Tense expresses that the verbal action is completed.

Forms of verb
Past Participle form is used in Present Perfect Tense. This form is also called 3rd form. Past Participle shows the completion of verbal action. That’s why it is used with the Perfect tenses.

  •  Past Participle, 3rd form (with all subjects)

Auxiliary
There are two auxiliaries (helping verbs) used in the Present Perfect Tense. With different subjects different auxiliaries are used. Details are as under.

  • Has (with he, she, it and singular noun)
  • Have (with I, you, they, we and plural noun)

Negative
When a sentence is converted into negative then not is used with the auxiliaries. You can use the short form too in which not is used with auxiliary as one word. Below are some examples to make you understand.

  • Has not (hasn’t in short)
  • Have not (haven’t in short)

Interrogative
While making interrogative the auxiliaries are used at the beginning of sentence.

  • Has / have used at the beginning of the sentence.

Examples of have

  1. I have highlighted this problem to all. (Positive sentence)
  2. You have not understood still. (Negative sentence)
  3. Have they gone out? (Interrogative sentence)

Examples of has

  1. Finally he has made me believe. (Positive sentence)
  2. She has not completed her home work. (Negative sentence)
  3. Has he worked out the problem? (Interrogative sentence)