Conjugación del verbo inglés
COULD INVESTIGATE

Verbo regular: investigate - investigated - investigated

Afirmación

Forma simple	Forma con V-ing
I could investigate you could investigate he could investigate we could investigate you could investigate they could investigate	I could be investigating you could be investigating he could be investigating we could be investigating you could be investigating they could be investigating
Perfecto	Perfecto con V-ing
I could have investigated you could have investigated he could have investigated we could have investigated you could have investigated they could have investigated	I could have been investigating you could have been investigating he could have been investigating we could have been investigating you could have been investigating they could have been investigating

Negación

Forma simple	Forma con V-ing
I couldn't investigate you couldn't investigate he couldn't investigate we couldn't investigate you couldn't investigate they couldn't investigate	I couldn't be investigating you couldn't be investigating he couldn't be investigating we couldn't be investigating you couldn't be investigating they couldn't be investigating
Perfecto	Perfecto con V-ing
I couldn't have investigated you couldn't have investigated he couldn't have investigated we couldn't have investigated you couldn't have investigated they couldn't have investigated	I couldn't have been investigating you couldn't have been investigating he couldn't have been investigating we couldn't have been investigating you couldn't have been investigating they couldn't have been investigating

Forma interrogativa

Forma simple	Forma con V-ing
could I investigate? could you investigate? could he investigate? could we investigate? could you investigate? could they investigate?	could I be investigating? could you be investigating? could he be investigating? could we be investigating? could you be investigating? could they be investigating?
Perfecto	Perfecto con V-ing
could I have investigated? could you have investigated? could he have investigated? could we have investigated? could you have investigated? could they have investigated?	could I have been investigating? could you have been investigating? could he have been investigating? could we have been investigating? could you have been investigating? could they have been investigating?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I investigate? couldn't you investigate? couldn't he investigate? couldn't we investigate? couldn't you investigate? couldn't they investigate?	couldn't I be investigating? couldn't you be investigating? couldn't he be investigating? couldn't we be investigating? couldn't you be investigating? couldn't they be investigating?
Perfecto	Perfecto con V-ing
couldn't I have investigated? couldn't you have investigated? couldn't he have investigated? couldn't we have investigated? couldn't you have investigated? couldn't they have investigated?	couldn't I have been investigating? couldn't you have been investigating? couldn't he have been investigating? couldn't we have been investigating? couldn't you have been investigating? couldn't they have been investigating?