Which word would require you to change the y to i before adding the suffix -ed?

fray
stay
shy
try

Urban and rural antonyms synonyms neither

Based on this excerpt the authors are mostly likely to attempt to answer which question?

Identify what is wrong with each italicized pronoun reference. carolyn sang higher than the other sopranos but she didn't support it properly. placed too far from antecedent no specific antecedent ambiguous reference