Subject and the predicate in this senetcne Do not speak I'll ​ of everyone

Subject : You (implied)

Predicate : do not speak ill of everyone

Explanation:

The subject and predicate differs in that ; the doer of an action, either a person or thing is called the subject, while the action being performed or information about the subject is called the predicate.

In the sentence Given above;

Do not speak ill of everyone - This statement points to an action performed, that is speaking of people, which should be the predicate as it gives advise to the subject about what should not be done.

The subject here is implied, this is the person being referred to in the sentence and could be 'You'

Hence, an explicit sentence, would be :

You should not speak ill of everyone.

You - /subject

Do not speak ill of everyone - predicate