Dear Eric

Hi! Eric
I am so sad that I can't see you often.
I always miss you and Soy and Rooney.
I want to play again with you and Soy and Rooney.
I sometimes imagine that I play with you and Soy and Rooney.
I want to play with you and Soy and Rooney in the playground.
I want to have a party with you and Soy and Rooney.
I want to go to the zoo with you and Soy and Rooney.
I want to go to the aquarium with you and Soy and Rooney.
I want to do lots of things with you and Soy and Rooney.
I will to go there someday.
I want to visit your house.
I will invite you to my house someday.
I miss you
Bye :)

Hi, Eric! 

             I am so sad that I can't see you often. I always miss you, Soy and Rooney, I want to play with all of you again. I sometimes imagine that we play together. I want us to play in the playground. I want us to have a party, go to the zoo and aquarium and do a lot of things. I will go there someday and I also want to visit your house. I will invite you to my house someday. I miss you! Bye! :)

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 Hello, Ruby! 

          You are good at creating sentences, however there are sentences that you can just put together into one sentence. That way will make you writing more beautiful and easier to read and understand. Kindly check the corrections and changes I made on your letter. 

          Keep up the good work!