Prior to the sixteenth century, the sentence "You can stay, stay not you. " is grammatical, but it changes into "You can stay, can't you？ "in Modem English, which illustrates the phenomenon of ______.
Prior to the sixteenth century, the sentence "You can stay, stay not you. " is grammatical, but it changes into "You can stay, can't you？ "in Modem English, which illustrates the phenomenon of ______.
A.rule change
B.rule addition
C.rule loss
D.morphological change
