THE PAST TENSE

PAST PRESENT

Did I work?
SIMPLE PAST Negative form Question? Interrogative
I worked you worked He went to class yesterday.
I did not work You did not work He did not go to class.
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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