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Which is the correct grammar? Which is correct?

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closed as general reference by tchrist, TimLymington, Matt E. Эллен, RegDwigнt Aug 22 '12 at 9:16

This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information.If this question can be reworded to fit the rules in the help center, please edit the question.

"I didn't spend" is correct. Didn't is already the past tense.

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The negation of I spent is built by adding the basic form of the verb (in this case spend) to the negation of did.

I didn't spend.

Spent would be used in the present perfect.

I have spent $100.
I have not spent $900.

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I didn't spend is correct. You must use the infinitive, not the simple past. (The helper verb do takes the simple past already.)

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