Present Perfect: Form

For the present perfect we use the past participle (third form) of the verb with the present simple of the primary verb "have". With regular verbs, the third form is identical to the Past Simple: Form.

I have played,  you have worked hard,   Maria has announced her engagement.

Some verbs have irregular third forms, e.g: have – had, come – come, These must simply be learnt.

Pronunciation
In informal writing, HAVE is often contracted. In speech, apart from formal oratory or to give emphasis, it is normally weakened or elided:

I have worked, I’ve worked. - 		/aɪhǝvwɜːkt, aɪjǝvwɜːkt,  aɪvwɜːkt/ he has worked, he’s worked. - 	/hiːhǝzwɜːkt, hiːjǝzwɜːkt, hiːzwɜːkt/

Negative forms and contractions
I/you/we/they have not worked,    I/you/we/they haven’t worked,      I’ve/you’ve/they’ve not worked,   she has not worked,		    she hasn’t worked		she’s not worked

Interrogative forms (with S-V inversion)
have I/you/we/they worked?

has she worked?

Interrogative-negative forms
Except in formal speech and writing, the contracted forms are used in negative questions.

''haven’t I/you/we/they worked? (have I/you/we/they not worked?) '' ''hasn’t she worked? (has she not worked?)''

HAVE alone
Have is used alone to replace the full perfect form in: