YOU SAID:

There is a cat on my window sill

INTO JAPANESE

私の窓の敷居に猫がいる

BACK INTO ENGLISH

There is a cat on the sill of my window

INTO JAPANESE

私の窓の敷居には猫がいる

BACK INTO ENGLISH

There is a cat on the threshold of my window

INTO JAPANESE

私の窓の敷居には猫がいる

BACK INTO ENGLISH

There is a cat on the threshold of my window