How do you tell a sentence is positive in English grammar.

Affirmative

Explanation:

The original word in Latin positivus (settle by agreement, positive) means formally stated, definite. It's affirmative (affirmativus: making firm), refering to terms for a sentence, clause, verb, or other expression that is not negative (She is studying) as opposed to She is not studying). It is also the base form, for example, with adjectives (big : positive) as opposed to the comparative or superlative forms (bigger; biggest).

A positive sentence is a sentence that tells you how something is, as opposed to how it is not. These sentences can be identified in two different ways. First, we can identify them by their meaning. If the meaning is affirmative (it does not deny anything), then the sentence is positive. These sentences can also be identified by their lack of negative words, such as no, never, not, no one, nobody, etc.