should investigate
Verbo regular: investigate - investigated- investigated

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd investigate
you'd investigate
she'd investigate
we'd investigate
you'd investigate
they'd investigate 	I'd be investigating
you'd be investigating
she'd be investigating
we'd be investigating
you'd be investigating
they'd be investigating	I should've investigated
you should've investigated
she should've investigated
we should've investigated
you should've investigated
they should've investigated	I should've been investigating
you should've been investigating
she should've been investigating
we should've been investigating
you should've been investigating
they should've been investigating	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't investigate
you shouldn't investigate
she shouldn't investigate
we shouldn't investigate
you shouldn't investigate
they shouldn't investigate 	I shouldn't be investigating
you shouldn't be investigating
she shouldn't be investigating
we shouldn't be investigating
you shouldn't be investigating
they shouldn't be investigating	I shouldn't have investigated
you shouldn't have investigated
she shouldn't have investigated
we shouldn't have investigated
you shouldn't have investigated
they shouldn't have investigated	I shouldn't have been investigating
you shouldn't have been investigating
she shouldn't have been investigating
we shouldn't have been investigating
you shouldn't have been investigating
they shouldn't have been investigating	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I investigate?
should you investigate?
should she investigate?
should we investigate?
should you investigate?
should they investigate? 	should I be investigating?
should you be investigating?
should she be investigating?
should we be investigating?
should you be investigating?
should they be investigating? 	should I have investigated?
should you have investigated?
should she have investigated?
should we have investigated?
should you have investigated?
should they have investigated? 	should I have been investigating?
should you have been investigating?
should she have been investigating?
should we have been investigating?
should you have been investigating?
should they have been investigating? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I investigate?
shouldn't you investigate?
shouldn't she investigate?
shouldn't we investigate?
shouldn't you investigate?
shouldn't they investigate? 	shouldn't I be investigating?
shouldn't you be investigating?
shouldn't she be investigating?
shouldn't we be investigating?
shouldn't you be investigating?
shouldn't they be investigating? 	shouldn't I have investigated?
shouldn't you have investigated?
shouldn't she have investigated?
shouldn't we have investigated?
shouldn't you have investigated?
shouldn't they have investigated? 	shouldn't I have been investigating?
shouldn't you have been investigating?
shouldn't she have been investigating?
shouldn't we have been investigating?
shouldn't you have been investigating?
shouldn't they have been investigating?