A declarative sentence can be called an assertive sentence, though I prefer declarative. Affirmative is the opposite of negative. "Affirmative sentence" does not mean declarative sentence.
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hanuman_2000A declarative sentence
A declarative sentence is also called an assertion.
Assertions can be affirmations or negations.
Declaratives:
The cat is on the mat. (affirmative assertion)
The cat is not on the mat. (negative assertion)
This is how I understand it.
CJ