Answer:
Sabnam didn't meet Sudha yesterday.
Step-by-step explanation:
A negative sentence tells you that something is not so. Positive sentences can be formed into negative sentences by adding the words not, doesn't, didn't, wasn't, can't couldn't, shouldn't, etc.
Sabnam met Sudha yesterday is a positive sentence, so it must be changed into a negative sentence.
We can do this by adding one of the words mentioned above.
Sabnam didn't meet Sudha yesterday is a negative sentence and your answer.
Have a great rest of your day! :)