could summate
Verbo regular: summate - summated- summated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could summate
you could summate
he could summate
we could summate
you could summate
they could summate 	I could be summating
you could be summating
he could be summating
we could be summating
you could be summating
they could be summating	I could have summated
you could have summated
he could have summated
we could have summated
you could have summated
they could have summated	I could have been summating
you could have been summating
he could have been summating
we could have been summating
you could have been summating
they could have been summating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't summate
you couldn't summate
he couldn't summate
we couldn't summate
you couldn't summate
they couldn't summate 	I couldn't be summating
you couldn't be summating
he couldn't be summating
we couldn't be summating
you couldn't be summating
they couldn't be summating	I couldn't have summated
you couldn't have summated
he couldn't have summated
we couldn't have summated
you couldn't have summated
they couldn't have summated	I couldn't have been summating
you couldn't have been summating
he couldn't have been summating
we couldn't have been summating
you couldn't have been summating
they couldn't have been summating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I summate?
could you summate?
could he summate?
could we summate?
could you summate?
could they summate? 	could I be summating?
could you be summating?
could he be summating?
could we be summating?
could you be summating?
could they be summating? 	could I have summated?
could you have summated?
could he have summated?
could we have summated?
could you have summated?
could they have summated? 	could I have been summating?
could you have been summating?
could he have been summating?
could we have been summating?
could you have been summating?
could they have been summating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I summate?
couldn't you summate?
couldn't he summate?
couldn't we summate?
couldn't you summate?
couldn't they summate? 	couldn't I be summating?
couldn't you be summating?
couldn't he be summating?
couldn't we be summating?
couldn't you be summating?
couldn't they be summating? 	couldn't I have summated?
couldn't you have summated?
couldn't he have summated?
couldn't we have summated?
couldn't you have summated?
couldn't they have summated? 	couldn't I have been summating?
couldn't you have been summating?
couldn't he have been summating?
couldn't we have been summating?
couldn't you have been summating?
couldn't they have been summating?