The boy ____ we saw yesterday is Betty's brother.能用whom填空吗?为什么只用that/who,不能用whom?

I saw a boy ____(run)from the cinema then. The boy ____ we saw yesterday is Betty's brother.能用whom填空吗?为什么只用that/who,不能用whom? We found he was a clever boy.(同义句) We ____ the boy ____. wo saw the boy run into the building同义句the boy ____ _____ ______run intothe building. All of ____ sudden,we saw a boy rush out of ___ nack door. A a;a B a;the C the;the D the;a 求解析是back door 英语：Did you see ____ tigers in the zoo?Yes.We also saw ____ elephants there. We found he was a clever boy.(同义句) We ____ the boy ____.为什么这么填. we saw the boy go into the room改为被动语态可不可以改成 we were seen the boy go into the room 1、samuel runs very fast,so he is____(可能的)to be the winner of the race2、my sister is going to help with the housework at my ____(祖父母)3、he was caught ____(毁坏)the old church when we saw him4、the bell____(响)for class5、the boy the boy is 5 years old 同义 this is a —— —— boywe saw that were playing football 同义we saw —— —— football The cat ____ ____(跳下）the tree when it saw a boy throw at it.空里是填jumped down 还是jumped off 我们围坐在蛋糕周围,看他许愿.we sat around the cake and saw him a ____ ____ 1）We saw three children under the tree.One is a boy,____ are girls.a.the other b.other two v.others d.the other two2)This key _______ be peters.He still in the locka.may not b.can't d.mustn't c.neddn't3)Some students of Grade 8 are for the desion w 英语 :用适当的关系词填空.1.This is the professor _______ taught me chemistry in 1980.2.The hospital ____ was built five years ago has been modernized3.This is the boy _____ father died three years ago.4.The film ______ we saw the day befor What can we do ____ (help) the sick boy?助人为乐啊. We saw three children under the tree.One is a boy,_are girls.A.B.the otherC.othersD.the other two We saw three children under the tree.One is a boy,____are girls.A.the other B.the other two C.others D.other two请说明理由 i saw him ____(walk)into the