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Anonymous Posted 11 years ago
Grammar

Haven't or didn't?

Hi! I've always wondered this...
I don't understand when I need to use /haven't + past participle/ or /didn't + present/ in a sentence.
Could somebody explain this to me? Thank you.
  

Top answer

"did not / didn't" followed by the base form of the verb (not really the "present" as you state) is the negative form of the simple past tense. "have not / haven't / has not / hasn't + past participle" is the negative form of the present perfect tense. There are many websites that explain in detail the use of these and other English tenses.

— GPY

  • "did not / didn't" followed by the base form of the verb (not really the "present" as you state) is the negative form of the simple past tense.
  • "have not / haven't / has not / hasn't + past participle" is the negative form of the present perfect tense.
  • There are many websites that explain in detail the use of these and other English tenses.
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1 Answers
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"did not / didn't" followed by the base form of the verb (not really the "present" as you state) is the negative form of the simple past tense.

"have not / haven't / has not / hasn't + past participle" is the negative form of the present perfect tense.

There are many websites that explain in detail the use of these and other English tenses. For example:

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