21. What are they?
"The Perpendicular," "Suspended Macron," etc.
22. Is the letter y ever marked by Diacritical Marks?
It is, sometimes.
23. What marks are used for y?
Macron and Breve.
24. Give examples where y is marked with the Macron.
Spȳ, slȳ, stȳ, etc.
25. Give example where y is marked with the Breve.
Hy̆mn.