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2-7 Spelling Tip Short u. The sign for short u is //. The short u sound is in run, but, and must.   Words Sentences 1. must You must go to bed now. 2. stuck My foot is stuck in the hole. 3. mud I have mud on my shoes. 4. luck "Good luck," she said. 5. under It is under the table. 6. uncle I have an aunt and uncle. 7. upset Dad is very upset with me. 8. upon Once upon a time...... 9. spun The spider spun a web. 10. shun To shun is to be unfriendly. 11. us Dad came with us. 12. unless Yes, unless it is no. 13. such The circus was such fun! 14. until Wait until tomorrow. 15. ugly The mask is very ugly.