English verb conjugation
CAN OBSTRUCT

Regular verb: obstruct - obstructed - obstructed

Affirmation

Simple form	V-ing form
I can obstruct you can obstruct he can obstruct we can obstruct you can obstruct they can obstruct	I can be obstructing you can be obstructing he can be obstructing we can be obstructing you can be obstructing they can be obstructing
Perfect	V-ing perfect
I can have obstructed you can have obstructed he can have obstructed we can have obstructed you can have obstructed they can have obstructed	I can have been obstructing you can have been obstructing he can have been obstructing we can have been obstructing you can have been obstructing they can have been obstructing

Negation

Simple form	V-ing form
I cannot obstruct you cannot obstruct he cannot obstruct we cannot obstruct you cannot obstruct they cannot obstruct	I cannot be obstructing you cannot be obstructing he cannot be obstructing we cannot be obstructing you cannot be obstructing they cannot be obstructing
Perfect	V-ing perfect
I cannot have obstructed you cannot have obstructed he cannot have obstructed we cannot have obstructed you cannot have obstructed they cannot have obstructed	I cannot have been obstructing you cannot have been obstructing he cannot have been obstructing we cannot have been obstructing you cannot have been obstructing they cannot have been obstructing

Interrogative form

Simple form	V-ing form
can I obstruct? can you obstruct? can he obstruct? can we obstruct? can you obstruct? can they obstruct?	can I be obstructing? can you be obstructing? can he be obstructing? can we be obstructing? can you be obstructing? can they be obstructing?
Perfect	V-ing perfect
can I have obstructed? can you have obstructed? can he have obstructed? can we have obstructed? can you have obstructed? can they have obstructed?	can I have been obstructing? can you have been obstructing? can he have been obstructing? can we have been obstructing? can you have been obstructing? can they have been obstructing?

Interro-negative form

Simple form	V-ing form
can I not obstruct? can you not obstruct? can he not obstruct? can we not obstruct? can you not obstruct? can they not obstruct?	can I not be obstructing? can you not be obstructing? can he not be obstructing? can we not be obstructing? can you not be obstructing? can they not be obstructing?
Perfect	V-ing perfect
can I not have obstructed? can you not have obstructed? can he not have obstructed? can we not have obstructed? can you not have obstructed? can they not have obstructed?	can I not have been obstructing? can you not have been obstructing? can he not have been obstructing? can we not have been obstructing? can you not have been obstructing? can they not have been obstructing?