I bought 16 banana's . Use apostrophes when deleting existing letters for a contraction. Do not becomes don't. Hence, the early '80s is a contraction. Its does show possession, but this is a pronoun.
Sentence fragments lack a subject or verb.
Bill went to the store and bought food. Pretzels and other snacks especially. Bill went to the store and bought food, especially pretzels and other snacks. Some writers write, when a person goes to the store, they should buy groceries . One person, however, cannot be a they.