they have (able)to speak english well

they have (able)to speak english well 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? were able to have done It's our duty to help b___ people because they aren't able to see. It's our duty to help (b ) people because they aren't able to see They ___(not be)able to have lessons for 3 months. They __(not be) able to have lessons for 3 months They have already read an write填问号（can,could,be able to）适当形式 That’s how they are able to do it.应该怎么翻译最妥 They( )two free tickets to Canada,otherwise they'd never have been able to afford to go.A.had got Bgot C.have got Dget They ___ two free tickets to Canada,otherwise they’d never have been able to afford to go.A.had got B.got C.have got D.get 英语翻译Piper turned four in May,but her parents have never been able to take her home to their small apartment in Manhattan,New York.Instead they have structured their lives around whatever hospital she's in.They travel three small highways to s 现在完成时还是一般过去时(单选)?They______( got,have got)two free tickets to Canada,otherwise they'd never have been able to afford to go.请说明原因. able to have such a long holiday They _ to buy a nice house,but they weren't able to get so much money.A.hoped B.had hoped C.have hoped D.would hope it's hard to say they have many things in ) They like to have hot s() and meat They might be able to afford a new car .be able to 能用can替代吗?