PRESENT PERFECT1. FORM HAVE /HAS + PAST PARTICIPLE

*- ED (REGULAR VERBS) I have worked all day

* 3rd COLUMN( IRREGULAR VERBS) I have eaten too much

2. USEWe use the PRESENT PERFECT to talk about life experiences (things we have done) without mentioning the time.I HAVE GONE ON A HOT AIR BALLOON

I HAVE FLOWN A PLANE

WHEN DID YOU DO IT?I went on a hot air balloon last spring

I flew a plane two summers ago

IF YOU MENTION THE TIME WHEN YOU DID SOMETHING, THEN YOU HAVE TO USE

PAST SIMPLE

You ALSO use the PRESENT PERFECT:To express ACTIONS which STARTED in the PAST and CONTINUE up to the PRESENT and are RELEVANT for the present.Mary and Tim have gone out for two years

Mary and Time have gone out since 2013 (It's 2015 now)

The PRESENT PERFECT in this example expresses DURATION:Mary and Tim met in the autumn of 2013 and it's now 2015 so THEY HAVE BEEN TOGETHER (FOR) ALL THIS TIME!!!!

3. TIME EXPRESSIONS AND OTHERS:LIFE EXPERIENCES:Have you ever climbed a mountain?I have NEVER climbed a mountainONCE, TWICE in my lifeDURATION:How long have you known John?FOR (years, months, hours, days, ages...)SINCE (2005, last April, since I was little, since I was born...)

WE USE SOME ADVERBS WITH THE PRESENT PERFECT:

JUST- I have just eaten (Acabo de...)ALREADY- I have already eaten (Ya he...)YET- Have you eaten yet? (Ya...?) I haven't eaten yet (Todava, an...)

PRESENT PERFECT CONTINUOUS:HAVE/ HAS BEEN + - ING

It expresses that something has been done, but it may not be finished yet.

I have lived in this house for 10 years (and today I'm saying goodbye because I'm moving out)

I have been living in this house for 10 years (and I hope to spend many more years here!)