could corrugate
Verbo regular: corrugate - corrugated- corrugated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could corrugate
you could corrugate
he could corrugate
we could corrugate
you could corrugate
they could corrugate 	I could be corrugating
you could be corrugating
he could be corrugating
we could be corrugating
you could be corrugating
they could be corrugating	I could have corrugated
you could have corrugated
he could have corrugated
we could have corrugated
you could have corrugated
they could have corrugated	I could have been corrugating
you could have been corrugating
he could have been corrugating
we could have been corrugating
you could have been corrugating
they could have been corrugating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't corrugate
you couldn't corrugate
he couldn't corrugate
we couldn't corrugate
you couldn't corrugate
they couldn't corrugate 	I couldn't be corrugating
you couldn't be corrugating
he couldn't be corrugating
we couldn't be corrugating
you couldn't be corrugating
they couldn't be corrugating	I couldn't have corrugated
you couldn't have corrugated
he couldn't have corrugated
we couldn't have corrugated
you couldn't have corrugated
they couldn't have corrugated	I couldn't have been corrugating
you couldn't have been corrugating
he couldn't have been corrugating
we couldn't have been corrugating
you couldn't have been corrugating
they couldn't have been corrugating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I corrugate?
could you corrugate?
could he corrugate?
could we corrugate?
could you corrugate?
could they corrugate? 	could I be corrugating?
could you be corrugating?
could he be corrugating?
could we be corrugating?
could you be corrugating?
could they be corrugating? 	could I have corrugated?
could you have corrugated?
could he have corrugated?
could we have corrugated?
could you have corrugated?
could they have corrugated? 	could I have been corrugating?
could you have been corrugating?
could he have been corrugating?
could we have been corrugating?
could you have been corrugating?
could they have been corrugating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I corrugate?
couldn't you corrugate?
couldn't he corrugate?
couldn't we corrugate?
couldn't you corrugate?
couldn't they corrugate? 	couldn't I be corrugating?
couldn't you be corrugating?
couldn't he be corrugating?
couldn't we be corrugating?
couldn't you be corrugating?
couldn't they be corrugating? 	couldn't I have corrugated?
couldn't you have corrugated?
couldn't he have corrugated?
couldn't we have corrugated?
couldn't you have corrugated?
couldn't they have corrugated? 	couldn't I have been corrugating?
couldn't you have been corrugating?
couldn't he have been corrugating?
couldn't we have been corrugating?
couldn't you have been corrugating?
couldn't they have been corrugating?