The present perfect simple expresses an action that is still going on or that
stopped recently, but has an influence on the present. It puts emphasis on
the result.
Forms of Present Perfect
General structure :Have (in the simple present) + Verb (in the past participle form)
affirmative
subject+have+past participle
example:I have spoken
negative
subject+have not+past participle
example: I haven´t spoken
interrogative
Have+subject+pastparticiple
example:Have I spoken?
verbs
regular
ends with -ed
irregular
change the verb form
Uses
puts emphasis on the result
Example: She has written five letters.
action that is still going on
Example: School has not started yet.
action that stopped recently
Example: She has cooked dinner
finished action that has an influence on the present
Example: I have lost my key.
action that has taken place once, never or
several times before the moment of speaking