When do you add an ly or lly to adjectives?

You add "-ly" or "-lly" to adjectives to form adverbs. Here's a breakdown:

General Rule:

* Add -ly to most adjectives to form an adverb:

* slow → slowly

* happy → happily

* quick → quickly

Exceptions:

* Adjectives ending in -y: Change the "y" to "i" and add "-ly":

* easy → easily

* happy → happily

* pretty → prettily

* Adjectives ending in -le: Change the "e" to "y" and add "-ly":

* gentle → gently

* terrible → terribly

* simple → simply

* A few adjectives have irregular adverb forms:

* good → well

* bad → badly

* fast → fast

Examples:

* She walked slowly down the street. (Adverb describing how she walked)

* The dog barked loudly. (Adverb describing how loudly the dog barked)

* The children played happily in the park. (Adverb describing how the children played)

Let me know if you have any other grammar questions!