He has been able to tell us more about active volcanoes than any man alive.这里为什么是用现在完成时,而不是一般现在时?

翻译：He has been able to tell us more about active volcanoes than any man alive. 快,1道初二英语选择Man has ( ) build a modern world because he has languageA.to able to B.be able to C.able to D.been able to翻译 并说明理由 he has not been able to get his own car into his garage这句话的时态是什么? he has not been able to get his own car into his garage这句话是什么时态 英语句子结构问题He has been able to tell us more about the active volcanoes than any man alive.知道were able to 意思.为什么是has been , he has not been able to get his own car into his garage even once 这里的not 和been的位置调换可以吗 he's be able to……he's的完整形式如果是has的后面不就是been了么 Joe is fine,but he has not been able to do m____in the garden because of the w____,which has been terrible.Actually it has rained every day for the p_____few weeks. he has been to beijing.什么时态? 请帮忙解释为什么用现在完成时,Because of this,he has not been able to get his own car into his garage even once. He has been able to tell us more about active volcanoes than any man alive.这里为什么是用现在完成时,而不是一般现在时? He has not been able to get his own car into his garage even once.这句话是被动语态吗?帮我解释下语 The headmaster owes__C___to his wife that he has been able to put all his heart into his work.A、that B、it C、much D、so The headmaster owes_B__to his wife that he has been able to put all his heart into his work.选B?A、that B、it C、much D、so The headmaster owes_B__to his wife that he has been able to put all his heart into his work.A、that B、it C、much D、so He think he has been to shanghai ,does he. He has not been able to get his own car into his garage even once这里表被动吗?好像不是表被动 可是这里面有have/has been done的句式啊 为什么不是表被动? He has been to the Great Wall中为什么been