our dog,rex,used to sit outside our front gate and bark.为什么bark不用过去时?并列句used阿.

our dog,rex,used to sit outside our front gate and bark.为什么bark不用过去时?并列句used阿. Our dog ,Rex ,used to sit outside our front gate and bark .Every time he wanted to comeinto the garden he would bark until someone opened the gate .As the neitherbours complained of the noise ,my husband spent weeks training him to press his paw on t our dog,Rex,____(sit)outside our front gate and bark.应该把sit写成什么形式在说出为什么这样填，根据什么语法形式 A:Whose dog is it?B:_______our dog._______name is Rex. 改错.Our hometown is no longer what it used to. There [ ]a river in front of our houseA used to have B was used to C used to be D was used to being 请教一道改错题改错.This dog is more than a pet dog.It is used to a guide dog by Grandpa Lin and helps him walk safely. I used to have a dog 我以前养过一只狗,翻译的对吗 My father used sticks to make a house for my dog.怎么填同义句 Ln our town,wood can_ a fire A.be used to make B.be used to making C.use to make D.used to making 填空：My grandfather used to walk a dog after dinner.My grandfather ＿＿＿ ＿＿＿ to walk a dog after dinner.（改为否定句） 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 Our dog,cat and rabbit had to play to a certain extent by our rules.求翻译,机器不要, 如何理解这句话?Our son used our comforter to make the mattress bearable for our stay.这句话怎么理解：Our son used our comforter to make the mattress bearable for our stay.前面在说酒店的床 为啥 our parents often （ ）to school on foot before A,go B.used C.used to go D.are used to 英语选择.-------twice ,the postman refused to deliver our letters unless we changed our dog.------twice ,the postman refused to deliver our letters unless we changed our dog.A.Being bittenB.BittenC.Having bittenD.To be bitten请详细解释一下 英语选择.-------twice ,the postman refused to deliver our letters unless we changed our dog.------twice ,the postman refused to deliver our letters unless we changed our dog.A.Being bittenB.BittenC.Having bittenD.To be bitten请详细解释一下 used to