YOU SAID:
My little sister can't be this cute!
INTO JAPANESE
私の妹は、このかわいいできません!
BACK INTO ENGLISH
My sister can not be this cute!
INTO JAPANESE
私の妹はこのかわいいことができない!
BACK INTO ENGLISH
My sister can not do this cute thing!
INTO JAPANESE
私の妹はこのかわいいことをすることはできません!
BACK INTO ENGLISH
My sister can not do this cute thing!
Come on, you can do better than that.