I have a pencil case.
I have 18 colored pencils.
I have a white eraser.
I have 36 crayons.
I have 4 pencils.

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Hello Joan!

      Thank you so much for sending your homework. Wow! You have a lot of school supplies. Your sentence were correct and that's a good job. I just corrected the second one. "Colored" here acts as adjective that describe what kind of pencils do you have. 

       Keep your interest in learning Joan. I am happy to be your teacher. Study well and keep on practicing what you have learned so that you will improve more your English skills. Take care always!

T.Cassie ^_^