We can make an adjective into an adverb by adding -ly to the adjective. If the adjective ends in a -y, change the -y to an -i before adding -ly.
Here are some adjectives that end in -y. Notice how we change the spelling when adding -ly to make an adverb.
busy – busily
happy – happily
steady – steadily
lucky – luckily
cheery – cheerily
drowsy – drowsily
stingy – stingily
breezy – breezily
Adjectives ending in -y change the -y to -i before adding -ly when they become an adverb.
Now you try it. Change the adjective in the first sentence to an adverb for the blank in the second sentence. Be sure to spell the adverb correctly when adding -ly. John is a happy boy. He plays ____ in the back yard.