2016年江西成人高考高起点英语语法复习情态动词(2)

en unknowingly caused by an electrician.

　　2.表示虚拟语气。

　　1) needn't have + 过去分词，表示做了不必做的事，相当于“didn't need to do”，译为“其实没必要……”。如：

　　You needn't have come over yourself.

　　As it turned out to be a small house party， we so formally.

　　[A] needn't dress up [B]did not need have dressed up

　　[C] did not need dress up [D] needn't have dressed up

　　(没有必要穿的那么正式，体现是说话者的建议，实际结果是否真的穿的很正式没有确定，答案为D)

　　2)should have +过去分词，表示应该做某事但实际上未做，译为“本应该……”should not + have过去分词表示本不应该做某事但实际上做了，译为“本不应该……”。如：

　　I regret having left the work unfinished; I should have planned everything ahead carefully.

　　我本来应该事先认真地把每件事情规划的很好，但实际上作者还是没有规划好，以至工作没有完成。

　　3) ought to have +过去分词，表示动作按理该发生了，但实际上未发生，译为“该……”，与should 的完成式含义类似。如：

　　The porter ought to have called the fire-brigade as soon as he saw the fire in the stock， which went up in smoke .

　　4) could have +过去分词，表示过