YOU SAID:

i am sitting on a blue chair

INTO JAPANESE

私は青い椅子に座っています

BACK INTO ENGLISH

I'm sitting in a blue chair

INTO JAPANESE

青い椅子に座っています

BACK INTO ENGLISH

Sitting in blue chair

INTO JAPANESE

青い椅子に座って

BACK INTO ENGLISH

Sitting on blue chair

INTO JAPANESE

青い椅子に座って

BACK INTO ENGLISH

Sitting on blue chair