when I stopped eating red meat for 3 months, I was iron deficient , since I didn't have enough veggies either or since I didn't had enough veggies? [duplicate]

Its a simple ask as it doesn't appear to be wrong while using it in emails etc.

I didn't had breakfast or i didnt have breakfast.

Which one of above is better in grammatical manner.


"I didn't have breakfast" is correct. After the auxiliary verb DO, we use the bare infinitive of the full verb, not a tensed form. "I didn't had breakfast" is wrong.


I didn't have is correct. The use of the auxiliary, to do, in negatives and interrogatives is always folllowed by the bare infinintive.