--whose watch is this ?---【 】,回答为什么不能是this is lucy‘s 而是it is

--whose watch is this ?---【 】,回答为什么不能是this is lucy‘s 而是it is Whose watch is this?It’s 1.Whose watch is this?It's watch Is this you pencil 为什么不能回答 yes,this is.而是要用Yes,it is. Whose watch is this?It’s_______. whose watch is this?it's____(i). Whose watch is this?Is it black（）? 为什么不能说Whose is this book? whose book is this?It's( ). 9.Whose desk is this?It’s( ) whose red jacket is this?it's whose watch is this?is it a black -------.填什么?为什么?