Question

I did my job well . ( change into negative )​

Answer 1

Answer:

I hadn't done my job too well .

Answer 2

Answer:

Negative form of the given sentence is I hadn't done my job too well .

Explanation:

The most famous way of positive sentence to negative sentence is Adding Not/No/Never. If the sentence have an auxiliary verb then put not after the auxiliary verb and If there is no axillary verb then use do-verb.

Here in the given sentence doesn't have any auxiliary verb.So we can use haven't.