例句:How I want to go to Beijing! 七.情态动词句型(含否定) should ,would, could, might, ought to完成时,表示过去本该做,打算做,想做而未做的事情. 1.should have done =ought to have done 本应该做而没做 2.would have done = 本来就会去做某事而没做 ...