THE PAST TENSE
PAST PRESENT

 

SIMPLE PAST I worked you worked He went to class yesterday.

Negative form I did not work You did not work He did not go to class.

Question? Interrogative Did I work? Did you work? Did he go to class?

PRESENT PERFECT - formed by the auxiliary have + past participle

I have worked for two years on that experiment
You have worked
s/he has worked

Negative form
I have not worked for two years, but for 18 months.

Question
Have you worked as long as that?

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