An affirmative sentence expresses the validity or truth of a basic assertion.
​It can also refer to the process of expressing agreement or consent as well as assenting.
Example: He is playing.
Negative sentences are declarative statements.
They relay information believed to be true.
Negative sentences are typically formed by adding the word not after the helping verb.
Example: He is not playing.
While transforming a sentence from one form to another, its essence, meaning and tense should not change.
If we find the word Always in an affirmative sentence, we will write the word Never instead of that word 'Always' and make the opposite word of a verb, adjective and noun at the time of negative sentence.
Example: I will always be with you. (Affirmative)
I will never be with you. (Negative)
The tenses of the verbs have been changed and not is used in other options which is incorrect while transforming the given sentence.