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These hikers are hopelessly lost in the woods and are staring blankly at their compass. Select ALL the grammatically correct negative questions they can ask to suggest an idea or state an opinion.
The correct answers are Shouldn't we ask someone for directions? and Isn't that map upside down?
Negative questions are an excellent way to politely express an opinion or seek agreement from others.
"Shouldn't we to ask..." is incorrect because modal verbs (like should) must be followed by a bare infinitive (without "to").
"Is not that map..." is incorrect because in formal uncontracted negative questions, "not" must follow the subject ("Is that map not upside down?").