be able do 的结构正确吗?eg.Those who were able to took advantage

be able do 的结构正确吗?eg.Those who were able to took advantage able to do be able+不定式有这样的短语吗? be able to do sth be able to do sth 的同义词是什么? might not be able to 什么结构的? be able to do sth 用be able to do sth造句要段小一点的 请问they have been able to do的时态是什么?been able to 和 be able to的区别是什么? I imagine sb.to be able to do sth.为什么这里是 to be able 的形式? 有be hard to do sth的结构吗? 用be able to do sth造句 be able to do sth 等于什么 be able to do sth 意思 用法! 英语 翻译 be able to do sth 怎样用be able to do造句? be able to do sb.a faver Do not you be able to You want to be able to do be able to do this with his hair but?你想做他的那种发型吗?请讲解下这句子这是在网上看到的，不太懂。 You won't be able to do it alone ,however much you try ,能不能解释一下语法结构