Present perfect (A2.4)

We've come a long way

Look at these phrases

Is this about the past or the present?

about the past

Scientists have invented the internet.

When did they invented the internet?

We don't know

IS the internet important now?

YEs.

The present perfect

We use it talk about something that happened in the past, but it has an effect in the present. We don't say exactly when it happened because it's not important.

We have studied English before this course.Scientists have not invented a terminator. Have you ever been in the UK?

We have studied English before this course.Scientists have not invented a terminator. Have you ever been in the UK?

What word appears on all sentences?

Auxiliary-negative-question

afirmative

Scientists have created inteligent robots.

This is the action

Jane has travelled a lot.

past participle

Subject

Have/has

Negative

Scientists haven't created inteligent robots.

Jane hasn't travelled a lot.

past participle

not

Have/has

Subject

PAst participles

It's a verb form that we need for certain tenses.

irRegular

Regular

add "-ed" to the verb

They change completely

Be - beengo - gone do - done see - seen hear -heard

Watch - watchedwork -worked open - opened close - closed study - studied

Closed questions

have Scientists created inteligent robots?

has Jane travelled a lot?

past participle

Have/has

Subject

open questions

have you ever played basketball?

-Yes, I have.

has Jane ever gone to space?

-no, she hasn't.

past participle

past participle

Have/has

Subject