He is able to grasp the theory only once you explain it to him这句有语法错误吗?我的意思是“只要解释一遍他就能掌握”

He is able to grasp the theory only once you explain it to him这句有语法错误吗?我的意思是“只要解释一遍他就能掌握” to grasp only in this way ____ to do the job well .Ahe is able Bis he able C were he able D he was able He is able to finish it.(改同义句) 英语翻译He is able to smell different kinds of smells. He will---- pass the exam if he studies hard Acan B is able to C he able to Dcould Michael______come.That's too bad.I thought he could comeA.isn' able to b.is able to C.wasn't able to d.was able to if he study hard,he will ( ）learn English well.里面应该填什么?选项有：be able to,is able to,can,able to,为什么? Only when he has finished his homework he is able to play ,如何变为半倒装,应为is able to he ...Only when he has finished his homework he is able to play ,如何变为半倒装,应为is able to he play 还是is he able to play 为什么 Could you please tell me if he ___finish the work on time A.could B.was able to C.is able to D.would be able to ,为什么? He is able to axplain the ______(原因) because he was there at that time. He is _____to do the work.He has the ______(able) to finish the difficult work. He______ to sing English songs when he was only six years oldA.canB.was able toC.is able toD.able to -Will he ____ come next month -I don't know so A be able B can C be able to D is able to 英语翻译能否为：A man who has the courage to grasp his own life，so he can grasp others' life. He will -------dress himself in half a year . A. is able B.can C.be bale to D.be able he is a ___(able) boy .It is difficult forhim to swim quickly He is going to be able to.请说明为什么不行 理由和原因