could obstruct
Verbo regular: obstruct - obstructed- obstructed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could obstruct
you could obstruct
she could obstruct
we could obstruct
you could obstruct
they could obstruct 	I could be obstructing
you could be obstructing
she could be obstructing
we could be obstructing
you could be obstructing
they could be obstructing	I could have obstructed
you could have obstructed
she could have obstructed
we could have obstructed
you could have obstructed
they could have obstructed	I could have been obstructing
you could have been obstructing
she could have been obstructing
we could have been obstructing
you could have been obstructing
they could have been obstructing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't obstruct
you couldn't obstruct
she couldn't obstruct
we couldn't obstruct
you couldn't obstruct
they couldn't obstruct 	I couldn't be obstructing
you couldn't be obstructing
she couldn't be obstructing
we couldn't be obstructing
you couldn't be obstructing
they couldn't be obstructing	I couldn't have obstructed
you couldn't have obstructed
she couldn't have obstructed
we couldn't have obstructed
you couldn't have obstructed
they couldn't have obstructed	I couldn't have been obstructing
you couldn't have been obstructing
she couldn't have been obstructing
we couldn't have been obstructing
you couldn't have been obstructing
they couldn't have been obstructing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I obstruct?
could you obstruct?
could she obstruct?
could we obstruct?
could you obstruct?
could they obstruct? 	could I be obstructing?
could you be obstructing?
could she be obstructing?
could we be obstructing?
could you be obstructing?
could they be obstructing? 	could I have obstructed?
could you have obstructed?
could she have obstructed?
could we have obstructed?
could you have obstructed?
could they have obstructed? 	could I have been obstructing?
could you have been obstructing?
could she have been obstructing?
could we have been obstructing?
could you have been obstructing?
could they have been obstructing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I obstruct?
couldn't you obstruct?
couldn't she obstruct?
couldn't we obstruct?
couldn't you obstruct?
couldn't they obstruct? 	couldn't I be obstructing?
couldn't you be obstructing?
couldn't she be obstructing?
couldn't we be obstructing?
couldn't you be obstructing?
couldn't they be obstructing? 	couldn't I have obstructed?
couldn't you have obstructed?
couldn't she have obstructed?
couldn't we have obstructed?
couldn't you have obstructed?
couldn't they have obstructed? 	couldn't I have been obstructing?
couldn't you have been obstructing?
couldn't she have been obstructing?
couldn't we have been obstructing?
couldn't you have been obstructing?
couldn't they have been obstructing?