Doubling the consonant before adding a suffix.

Add the suffix -ing to the word slap.

• slaped

• slapped

Answer explanation

Double the final consonant if the word ends with a consonant after a vowel in a one syllable word.

Add the suffix -ed to the word tip.

• tiped

• tipped

Answer explanation

Double the final consonant if a one syllable word ends with a consonant following a vowel.

Add the suffix -ing to the word refer.

• referring

• refering

Answer explanation

Double the final consonant if the last syllable is accented and the accent stays there after the suffix is added.

Add -er to the word kind.

• kinder

• kindder

Answer explanation

Double the final consonant in a one syllable word, if the final consonant follows a vowel.

The d is not doubled because it does not follow a vowel. It follows another consonant.

Add the suffix -ing to the word send.

• sendding

• sending

Answer explanation

Double the final consonant if the final consonant follows a vowel.

The d is not doubled because it does not follow a vowel. It follows another consonant.

Add the suffix -ful to the word hurt.

• hurttful

• hurtful

Answer explanation

Double the final consonant in a one syllable word if the consonant follows a vowel.

The t is not doubled because it does not follow a vowel. It follows another consonant.

Add the suffix -ing to the word deter.

• deterring

• detering

Answer explanation

Double the final consonant if the last syllable of the word is accented and the accent stays there after the suffix is added.

Add the suffix -ing to the word motor.

• motorring

• motoring

Answer explanation

Do not double the final consonant if the accent is not on the last syllable.

Add the suffix -er to the word rip.

• riper

• ripper

Add -ed to the word poke.

• poked

• pokked

Answer explanation

Double the final consonant if a one syllable word ends with a consonant following a vowel.

Poke does not end with a consonant. It ends with a vowel, so the k is not doubled.