PRESENT PERFECT VS SIMPLE PAST

PRESENT PERFECT

PAST SIMPLE

ü      We only know that it happened at some time before now ü      We use this tense to talk about past events and activities with results /consequences in the present I/you/ we/they HAVE FED the dog (+) He/she/it HAS FED the dog I/you/ we/they HAVEN’T FED the dog (-) He/she/it HASN’T FED the dog HAVE I/you/we/they FED the dog? Yes, I/you/we / they HAVE NO, I /you/ we  they HAVEN’T HAS he/she/it FED the dog? Yes, he/she/ it HAS No, he/she/it HASN´T What has he done? He has fed the dog TIME ADVERBIALS ü      We use NEVER and YET  in negative sentences ü      We use ALREADY in affirmative sentences ü      We use YET and EVER in questions REMEMBER YET: at the end ALREADY/EVER/NEVER: before the main verb

ü       We know exactly when the thing happened ü      We use this tense to talk about an action which started and finished in the past I FED the dog yesterday (+) I PLAYED football yesterday I DIDN´T FEED the dog yesterday (-) DID YOU FEED the dog yesterday? Yes, I DID No, I DIDN’T. I FED the cat YESTERDAY (morning, afternoon, evening) LAST night/ month Two hours AGO