YOU SAID:

My cat sleeps in boxes

INTO JAPANESE

うちの猫は箱の中で寝ます

BACK INTO ENGLISH

my cat sleeps in the box

INTO JAPANESE

私の猫は箱の中で寝ています

BACK INTO ENGLISH

my cat is sleeping in the box

INTO JAPANESE

私の猫は箱の中で寝ています

BACK INTO ENGLISH

my cat is sleeping in the box