he used to run fast.used to 是什么词性,成分?

he used to run fast.used to 是什么词性,成分? He had to run fast ( ) catch up with the bus. 一道英语单项选择：liu xiang used to run very fast,() Yes,you are rightAdid not he Bwas not he Cdid he D was he为什么选择C这句话是不是反义疑问句 He likes to show how ( ) he can run fast quiet quicker quickestHe likes to show how ( ) he can run( fast )(quiet )(quicker)( quickest)选其中一个填进去 She‘s trying to run fast.(对run fast提问) He didn't run( )catch up with me.A.fast enough B.enough fast C.fast enough to D.enough fast to选什么,为什么,怎么翻译呀! run fast He didn't run fast.He didn't catch the bus.(用enough…to改写句子) he.didn't run fast.he didn't catch the bus.(用enough…to连句) 请问He used to run downstairs at school.针对谓语该怎样提问? 英语填空The shy boy used to run away when he s____ a stranger He ___ fast,I think he is good____.(run) He can run fast enough to catch up with us.这句话的结构是什么?主谓宾是那些? he is too old to run ___to catch the busa.fast enough b.quickly enough c.enough fast .d enough quickly Mike——（填空）run to school in the past,now he gets used to——（填空）to school.A used to,run B was used to,running C used to,running D was used to,run选哪个 5.—He didn't win the race at last,did he?—___________,though he tried to run as fast as he co Mr.Green ____ fast and he likes ___ very much.填什么?A.run;runB.run;to runC.running;runningD.runs;running he could run fast.改为一般疑问句怎么写?