Conditional Perfect Progressive or Conditional Perfect Continuous

Signal words	Use	Form	Examples affirmative	Examples negative	Examples interrogative
	sth. that might have happened in the past (It's too late now.) emphasis: length of time of an action	would + have + been + infinitive + ing	I would have been working.	I wouldn't have been working.	Would I have been working?
			He would have been going.	He wouldn't have been going.	Would he have been working?
			I would have been going.	I wouldn't have been going.	Would I have been going?
			He would have been going.	He wouldn't have been going.	Would he have been going?