could think
Verbo irregular: think - thought- thought

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could think
you could think
he could think
we could think
you could think
they could think 	I could be thinking
you could be thinking
he could be thinking
we could be thinking
you could be thinking
they could be thinking	I could have thought
you could have thought
he could have thought
we could have thought
you could have thought
they could have thought	I could have been thinking
you could have been thinking
he could have been thinking
we could have been thinking
you could have been thinking
they could have been thinking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't think
you couldn't think
he couldn't think
we couldn't think
you couldn't think
they couldn't think 	I couldn't be thinking
you couldn't be thinking
he couldn't be thinking
we couldn't be thinking
you couldn't be thinking
they couldn't be thinking	I couldn't have thought
you couldn't have thought
he couldn't have thought
we couldn't have thought
you couldn't have thought
they couldn't have thought	I couldn't have been thinking
you couldn't have been thinking
he couldn't have been thinking
we couldn't have been thinking
you couldn't have been thinking
they couldn't have been thinking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I think?
could you think?
could he think?
could we think?
could you think?
could they think? 	could I be thinking?
could you be thinking?
could he be thinking?
could we be thinking?
could you be thinking?
could they be thinking? 	could I have thought?
could you have thought?
could he have thought?
could we have thought?
could you have thought?
could they have thought? 	could I have been thinking?
could you have been thinking?
could he have been thinking?
could we have been thinking?
could you have been thinking?
could they have been thinking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I think?
couldn't you think?
couldn't he think?
couldn't we think?
couldn't you think?
couldn't they think? 	couldn't I be thinking?
couldn't you be thinking?
couldn't he be thinking?
couldn't we be thinking?
couldn't you be thinking?
couldn't they be thinking? 	couldn't I have thought?
couldn't you have thought?
couldn't he have thought?
couldn't we have thought?
couldn't you have thought?
couldn't they have thought? 	couldn't I have been thinking?
couldn't you have been thinking?
couldn't he have been thinking?
couldn't we have been thinking?
couldn't you have been thinking?
couldn't they have been thinking?