1. Past simple vs. Present perfect
Grammar

2. Past simple (vt)
To express the idea that an action started and finished at a specific time in the past. Sometimes, the speaker may not actually mention the specific time, but they do have one specific time in mind.
Regular verbs: + ed Yesterday we danced at the party.
Irregular verbs: 2nd “row “ Yesterday we went to the party.
Interrogative: Did + heel ww Did you go to the party yesterday?
Negative: Did + not + heel ww We did not go to the party yesterday.
Signal Words: Yesterday, last (night, week, etc.), (a minute, an hour) ago, in 2014

3. Present perfect
To talk about unfinished actions that started in the past and continue to the present.
Have past participle Have we met before?
Has (he/she/it) past participle He has worked here since 2010.
Regular verb: ed I have lived here for ten years.
Irregular verb: 3rd “row” She has never seen him before.
Signal words: for (al), since, yet, just, already, never, ever.

4. Practice: past simple of present perfect?
1. My parents __________ (run) their own hotel for thirty years. 2. Last year I __________ (give) my first concert. 3. __________ you __________ (talk) to her yesterday? 4. I __________ never __________ (understand) English. 5. __________ she ever __________ (go) to London? 6. Last summer we __________ (camp) at a campsite in France. 7. We __________ (be) waiting here for hours. 8. The last time I __________ (dance) was in We __________ (live) here since 2012.