Spelling: With -y or -i

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Verb Ends in a Consonant + -y

Verb cry apply study

-ies cries applies studies

-ying crying applying studying

-ied cried applied studied

Verb Ends in Vowel + -y

Verb play

-ys plays

-ying playing

-yed played

 
Exceptions  pay/paid, say/said, lay/laid
Verb Ends in Vowel + -e

Verb die	-ying dying	-ied died

Two-Syllable Adjective Ends in -y

Adjective happy merry	i + a Suffix happier, happily, happiness merrier, merrily, merriment

Two-Syllable Adjective Ends in -ly

Adjective friendly

-lier friendlier

-liest friendliest

See also
Plural Forms of Nouns
Doubling Consonants
Internal ie/ei
Adding a Suffix