could differentiate
Verbo regular: differentiate - differentiated- differentiated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could differentiate
you could differentiate
he could differentiate
we could differentiate
you could differentiate
they could differentiate 	I could be differentiating
you could be differentiating
he could be differentiating
we could be differentiating
you could be differentiating
they could be differentiating	I could have differentiated
you could have differentiated
he could have differentiated
we could have differentiated
you could have differentiated
they could have differentiated	I could have been differentiating
you could have been differentiating
he could have been differentiating
we could have been differentiating
you could have been differentiating
they could have been differentiating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't differentiate
you couldn't differentiate
he couldn't differentiate
we couldn't differentiate
you couldn't differentiate
they couldn't differentiate 	I couldn't be differentiating
you couldn't be differentiating
he couldn't be differentiating
we couldn't be differentiating
you couldn't be differentiating
they couldn't be differentiating	I couldn't have differentiated
you couldn't have differentiated
he couldn't have differentiated
we couldn't have differentiated
you couldn't have differentiated
they couldn't have differentiated	I couldn't have been differentiating
you couldn't have been differentiating
he couldn't have been differentiating
we couldn't have been differentiating
you couldn't have been differentiating
they couldn't have been differentiating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I differentiate?
could you differentiate?
could he differentiate?
could we differentiate?
could you differentiate?
could they differentiate? 	could I be differentiating?
could you be differentiating?
could he be differentiating?
could we be differentiating?
could you be differentiating?
could they be differentiating? 	could I have differentiated?
could you have differentiated?
could he have differentiated?
could we have differentiated?
could you have differentiated?
could they have differentiated? 	could I have been differentiating?
could you have been differentiating?
could he have been differentiating?
could we have been differentiating?
could you have been differentiating?
could they have been differentiating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I differentiate?
couldn't you differentiate?
couldn't he differentiate?
couldn't we differentiate?
couldn't you differentiate?
couldn't they differentiate? 	couldn't I be differentiating?
couldn't you be differentiating?
couldn't he be differentiating?
couldn't we be differentiating?
couldn't you be differentiating?
couldn't they be differentiating? 	couldn't I have differentiated?
couldn't you have differentiated?
couldn't he have differentiated?
couldn't we have differentiated?
couldn't you have differentiated?
couldn't they have differentiated? 	couldn't I have been differentiating?
couldn't you have been differentiating?
couldn't he have been differentiating?
couldn't we have been differentiating?
couldn't you have been differentiating?
couldn't they have been differentiating?