3. PRESENT PERFECT
We use the present perfect tense to describe an action started in the past that is still true.
She has worked hard. (She has worked hard in the past and works hard now)
I have lost my keys. (the keys were lost in the past and are still lost)
Present perfect is made from the verb have and the past participle of another verb.
We use have with plural nouns and has with singular nouns.
The frogs have started croaking.
The frog has started croaking.
This is how have is used with pronouns.
I have
she has
he has
it has
we have
they have
you have
Usually we shorten them like this.
I’ve
she’s
he’s
it’s
we’ve
they’ve
you’ve
ANNE
I’ve hired a private investigator.
We also use the negative have not or haven't to talk about something not being done in the past and still not being done.
I have not met him.
I haven't met him.
ANNE
There’s something I haven’t told you.