If + subject + had + past participle +
			other words, subject + would have ('ve) +
			past participle + other words.
			OR
			Subject + would have ('ve) + past
			participle + other words if + subject +
			had + past participle + other words.
			(This form is used for BE and other verbs.)
			
			Examples:
			If he had been here yesterday, he would've
			helped you. / He would've helped you if he
			had been here yesterday.
			(He wasn't here yesterday, so he couldn't
			help you.)
			
			If I had had enough money, I would've
			traveled around the world. / I would've
			traveled around the world if I had had
			enough money.
			(I didn't have enough money, so I couldn't
			travel around the world.)
			
			If cars had cost less, I would've bought
			a new one. / I would've bought a new car
			if they had cost less.
			(New cars cost too much for me, so
			I couldn't buy one.)