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Others isn't an adjective but a pronoun. The adjective is other (without the s) We can say: The others aren't here, omitting the noun boys.
The possessive adjective its is correctly written without the apostrophe. So also hers, ours, yours, theirs take no apostrophe.
After is a preposition and we must use it with an ob|ect. Afterwards, then, after that are adverbs of time and we can use them alone.
Plenty isn't an adjective, but a noun meaning a large number or amount. The adjective is plentiful: Oranges are cheap now because they are plentiful