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

whose watch is that?（ ） whose watch is this?it's____(i). whose watch is that的意思是? whose watch is this 改同义句 The little boy can't tell ________.A.whose is that watch B.whose that watch is C.whose watch is that D.whose watch is Whose is the watch?同义句 1.Whose watch is this?It's watch Whose watch is this?Is it black（）? The two thieves fled the town separately ,___a bagA.each carrying B.whose that watch is C.whose watch is that D.whose watch is Whose watch is this?( ),I don't know. is,whose,watch,on,the,desk,the连词成句 This watch is not kate's ____can it be?(whose ,else)答案是whose else's whose 引导的宾语从句.这样：I don't know whose watch it is . —Is that your watch?—No,I can't tell____ A.whose that watch is B.whose watch is 为什么不选B呢? whose watch is this?is it a black -------.填什么?为什么? 题目：Whose watch is this? 填空：【】is this【】? 同义句转换. 一道复合从句的选择题—Is that your watch?—No,I can't tell ________.A.whose is that watch B.whose that watch isC.whose watch is that D.whose watch is我知道答案选B，因为我不太确定。 Whose is that watch 怎么变同义句?同义句转换：1.Whose is that watch？（ ）2.That eraser is hers .（ 3.This is my pen.（ ）4.Whose cups are those？（ ）