Respuesta:
Pasado simple:
Usa verbo auxiliar DID
Presente perfecto:
Usa auxiliar HAVE. / HAS y el verbo va expresado en pasado participio.
Ejemplos:
Pasado simple:
DID you Study English last Night?
(+) I studied English last night
(-) I didn't study English last night
Presents perfecto:
Have you gone to school by bus?
(+) I have gone to school by bus
(-) I haven't gone to school by bus
Has she written a wonderful novel?
(+) She has written a wonderful novel
(-) She hasn't written a wonderful novel
