SMT-PAST-past simple vs present perfect

SMT-PASTS-past simple vs present perfect
SMT-PASTS-past simple vs present perfect
SMT-PASTS-past simple vs present perfect
SMT-PASTS-past simple vs present perfect
SMT-PASTS-past simple vs present perfect
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Instrucciones del autor

The activity includes listening and speaking practice, so CHROME needs to be used. Instructions are included for provoking and using the icons.