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hAvE BEEn ABlE to Do

已经能够做到,是现在完成时

have not been able to do hw 680g 没能做HW 680克I might have been able to help you. 我也许有办法帮助你.

没有这种固定用法.如出现这种写法,实际上就是完成式have done,表示已经完成了某事,to do只是目的状语.一般的用法是:have been doing 现在完成进行时,表示从过去一直持续到现在的动作或状态.希望能够帮到你,祝你进步,加油!

had tried与过去事实相反的虚拟语气.

你好, 意思是:不得不做某事,必须做某事

我觉得是错的,if是引导条件状语从句,谓语用现在时

没有这种用法 这个其实就是完成式have done,to do是目的状语和前面没有关系.

等于be capable to do sth

whatwhat连接主语从句what i have been able to do我已经做得 这份整句子在hope的宾语从句中作主语have been 谓语 我希望我所做的对无望的人们有些帮助

have to do 指不得不做 have sb. doing 指让做某事

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