You may have noticed that some adjectives have two different forms, the -ed form and the -ing form. It may seem confusing, but really it is quite simple!
Adjective ending in -ed
This adjective describes how you or another person/being can feel. It is used to describe the feeling, not the thing that caused the feeling.
I am tired, because I worked all day long.
She is shocked, because she didn’t expect the surprise.
Adjective ending in -ing
This adjective describes something that can make you feel a certain way.
This work is tiring. (It is making the workers want to rest.)
The grammar is not confusing. (It won’t make you feel confused.)
Fill in the blank with the correct adjective form of the word in the parenthesis ( ).
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