When do we use PAST SIMPLE verbs?
When the action we are talking about is finished
When do we use PRESENT PERFECT SIMPLE verbs?
When the action we are talking about STARTED in the past but it is NOT finished // When the action we are talking about has finished RECENTLY
How do we form a PRESENT PERFECT verb?
HAVE/HAS + PAST PARTICIPLE (I have worked, You have finished, She has eaten)