Question

Please call your grandmother on her birthday, _____she'll get upset,​

Answer 1

Answer:

Please call your grandmother on her birthday, else she'll get upset.

Answer 2

Answer:

Please call your grandmother on her birthday, or she'll get upset,​

Explanation:

Or is a conjunction that connects two or more possibilities or alternatives. It connects words, phrases and clauses which are the same grammatical type:

The conjunction or is used to suggest that only one possibility can be realized. You can have tea or coffee. You can work hard or you can fail.

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