The girl which is reading a book under the tree is my sister.这句知错在哪儿是否语法错误

The girl (in red) is my sister.对括号提问.which the girl is your sister?还是 which is the girl yoursister?which the girl is your sister?还是 which is the girl your sister？说清楚为什么 Which is that girl. She is the girl which I served.改错题. Which girl is Sarah?- The one (填介词) Which girl is prettier ,the girl on the right or the girl on the left?如何回答 Which girl is prettier.the girl on the right or the girl on the lefl?如何回答 ( )the man and the woman there?(who's,who're,which is,which are) The girl which is singing is my sister 与The girl　who is singing is my sister都有么 which girl is your little sister?the girl in ____________long red coata long red coat This is the hotel at which we're staying.which可以省掉吗? which do youthink is Professor Wang?-The man (lying/is lying )on the sofa,re the girl --------- is playing the piano is Millie.A whom B who C which D what 7．----Which girl is your sister?---- The girl ___________is wearing dark glasses.7．----Which girl is your sister?---- The girl ___________is wearingdark glasses.A.which B.whose C.who D.whom为什么要选C? You're a girl like the beautiful girl like the boy who makes her laught ,but the boy which girl really love is who makes her cry who is the girl （that）is crying.为什么不能用which? Which girl is slimmer,the ______(2) one or the _____(3) one? the girl (that)you saw in the streets is mary.为什么不用which