PRESENT PERFECT
He’s been to Star Wars conferences all over the world. WE USE THE PRESENT PERFECT FOR EXPERIENCES THAT HAPPENED SOME TIME BEFORE NOW BUT WE DON’T KNOW OR DON’T SAY WHEN THEY HAPPENED
PAST SIMPLE
He met his wife, Holly, in 1994. WE USE THE PAST SIMPLE IF WE SAY EXACTLY WHEN SOMETHING HAPPENED
PRESENT PERFECT: THE FORM
AFFIRMATIVE
Subject+ have/has+ past participle
NEGATIVE
SUBJECT+ HAVE/HAS+ NOT+ PAST
PARTICIPLE
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