Usage and Grammar

Q. Does the phrase “all caps” take a singular or plural verb? Is it “All caps aren’t legible” or “All caps isn’t legible”? Does the result change if the phrase is written as “all capital letters” as in “All capital letters aren’t legible” versus “All capital letters isn’t legible”? I realize that the best solution may be to reword the sentence, but I’m also wondering whether you view the phrase as singular or plural.

A. Sorry to wiggle out of this one, but when it sounds awkward both ways, a technically correct answer (not that there is one, in this case) is of little use. Try “Text in all caps isn’t legible.”