There used to be a big tree in front of the house.把此句改成否定句怎么改?

______ plenty of water in this river.A.There used to being B.there used to beC.There is used to beingD.There was used to be 请问 There used to be a park. There [ ]a river in front of our houseA used to have B was used to C used to be D was used to being There _______ a lot of trees in the park,weren't there?A use to be B used to be C used be There --- a dirty lake, now here is a beautiful garden. A used to B used to be C used to have D is there used to be a church here ,----?A.don’t there B.used not there C.didn 't there D.didn ’t it 为什么 这道题选那个There used to be a tall tree in front of our classroom,__?A.used there B.didn't there C.wasn't there 理由是? There used to be a clean river.为什么不是There used to have a clean river -----used to --------an old watch in my home A.there have B.there be C.it be D.it have 英语翻译1.There used to be a tall tree in front of our classroom---?A.used there B.didn't there C .wasn't it D.did it There used to be a tower here,___?A.usedn't it B.used there C.didn't it D.didn't there Is there a hospital here?---No but there{ } Awould B used to C used to be D ought to 为什么选那个 选哪个 Do you remember there ___ a river here?A.used to be B.used to being C.was used to being D.was used to be 选什么,为什么? The foreigners __there,but they __the food there at first.A used to live ,didn't be used to B are used to living,didn't used to C used to live,weren't used to D used to living,usedn't to 选C 为什么选C be used to do 怎么用?后一个 空 不理 there--------a tall tree in front of the building over there,didn't there?a.was b.would be c.must be d.used to be Look,that is our new school building.There _____ old low houses.Look,that is our new school building.There _____ old low houses.A.used to B.used to be C.used to have D.used to having There _____ a lot of tigers there,but now they are endangered.A.were used B.used to C.used to be D.used to have说明原因喔,也要整句翻译吧 -------- a small book store in thistown.( they used to be ,it used to have ,there used to be ,there used to have)