Question

For which of the following do you need to double the final consonant before adding the suffix?

cost + -ly
shop + -er
limit + -ed
fear + -ing

Answer 1

Among the following words, the choice that you need to double the final consonant before adding the suffix to the base word is, shop + -er. The word shop plus -er becomes shopper with the double consonant p. The rule applied here is that, if the word is only one syllable and ends in a vowel and consonant, double the last letter before the vowel suffix.