Let's first have a look at the structure of the Conditional Perfect in terms of the various grammatical moods (indicative, interrogative, imperative) and in terms of polarity (positive and negative).
|indicative||She would have realised.|
|indicative contracted (1)||He'd have known.|
|indicative contracted (2)||They would've come|
|interrogative||Would you have cooked?|
|indicative||I would not have called.|
|indicative contracted (1)||You wouldn't have understood.|
|interrogative||Would they not have eaten?|
|interrogative contracted||Wouldn't she have studied?|
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