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注意情态动词完成式的用法有两方面的含义：

1.表示已经发生的情况

(1)must have +过去分词，表示对已发生情况的肯定推测，译为"(昨天)一定……"。如：

My pain must have been apparent the moment I walked into the room, for the first man I met asked sympathetically: "Are you feeling all right?"

(2)cant/couldn't have +过去分词，表示对已发生情况的否定推测，译为"(昨天)一定没……"。 如：

Mary couldn't have received my letter; otherwise she would have replied before now.

(3)may/might have +过去分词，表示对已发生的事情做不肯定、可能性很小的推测，或事实上根本没发生，译为"也许……"。如：

At Florida Power's Crystal River plant, a potentially serious leakage of radioactive water may have been 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，译为"其实没必要……"。如：

As it turned out to be a small house party, we needn't have dressed up so formally.

(2)should /should not have +过去分词，表示应该做某事但实际上未做，或本不应该做但实际上做了, 译为"本(不)应该……"。如：

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

(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，表示过去本来可以做但却未做，译为"完全可以……"。如：

What you said is right, but you could have phrased it more tactfully.

(5)may/might have + 过去分词，表示过去可以做但实际未做，译为"(那样)也许会……"。如：

It might have been better to include more punchy statistics and photos of equipment in the introduction to further assist first-time office automation managers.

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