Can you say "What's up" without adding a question mark? English Grammar Punctuation Question Marks 1 Answer Karen L. Jun 27, 2016 Yes, "What's up!" Answer link Related questions Which of the following sentences requires a question mark?: How do you want me to make the... Which of the following sentences requires a question mark?: The doorbell just rang Do you think... Which of the following sentences requires a question mark?: The folder is somewhere on the... Which of the following sentences requires a question mark?: What is their insignia Who are they What is a question mark? What is the origin of the question mark? What is an interrogative sentence? Where did the question mark come from? Do you have to put a question mark after a rhetorical question? Question #94c55 See all questions in Question Marks Impact of this question 4750 views around the world You can reuse this answer Creative Commons License