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Chef Luigi is staring at a mountain of 50 peeled garlic cloves. The recipe only called for two! Select ALL the grammatically correct statements Luigi can make to express his wasted effort.
The correct answers are I needn't have peeled all this garlic! and I didn't need to peel all this garlic, but I did!
Needn't have + past participle perfectly describes a completed but unnecessary action.
Didn't need to + base verb combined with "but I did" also works perfectly to show the action happened anyway. The other options mix up the grammar structures ("needn't to" and "didn't need have" are invalid combinations).