YOU SAID:

I am sitting in a chair on my porch

INTO JAPANESE

私は私のポーチの椅子に座っています

BACK INTO ENGLISH

I am sitting in the chair of my pouch

INTO JAPANESE

私はポーチの椅子に座っています

BACK INTO ENGLISH

I am sitting in the pouch's chair

INTO JAPANESE

私はポーチの椅子に座っています

BACK INTO ENGLISH

I am sitting in the pouch's chair