Present perfect

Affirmative Sentences

Subject+have or has+past participle

• We use have when the subject is I, you, we or they.

          Example They have known for a fornight.

• We use has when the subject is it,she or he.

          Example She has worked since May.

Negative Sentences

Subject+have or has+not + past participle


          Example He hasn't eaten.

Questions Sentences

have or has+subject+not + past participle


          Example Have you seen that?