-ful/-fuls 
It’s one cupful, but two cupfuls, not “two cupsful.” The same goes for “spoonfuls” and “glassfuls.”
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Read about the new edition of Common Errors in English Usage on the Common Errors blog.
If you are not ready for a change, you can still order the second edition at the discounted price of $12 (while supplies last). 
 
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