i'm no good at this 为什么不是not good

i'm no good at this 为什么不是not good I'm no good at it.与I'm not good at it.的区别. I'm not good at spoken English这句话为什么不是at speaking i m not good at NG为什么是NO GOOD 不是NOT GOOD? I'm not good at guess. Are you____the singing competition,Lucy?No.I'm not good at s no,l'm not good at maths问句 He is good in baskball 和I'm not good at good at play volleyb I'm not very good at _math,but I'm good at English I'm not __________(real) good at it . I'm not good at calating.的汉语是什么