may obstruct
Regular verb: obstruct - obstructed- obstructed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may obstruct
you may obstruct
she may obstruct
we may obstruct
you may obstruct
they may obstruct 	I may be obstructing
you may be obstructing
she may be obstructing
we may be obstructing
you may be obstructing
they may be obstructing	I may have obstructed
you may have obstructed
she may have obstructed
we may have obstructed
you may have obstructed
they may have obstructed	I may have been obstructing
you may have been obstructing
she may have been obstructing
we may have been obstructing
you may have been obstructing
they may have been obstructing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't obstruct
you mayn't obstruct
she mayn't obstruct
we mayn't obstruct
you mayn't obstruct
they mayn't obstruct 	I mayn't be obstructing
you mayn't be obstructing
she mayn't be obstructing
we mayn't be obstructing
you mayn't be obstructing
they mayn't be obstructing	I mayn't have obstructed
you mayn't have obstructed
she mayn't have obstructed
we mayn't have obstructed
you mayn't have obstructed
they mayn't have obstructed	I mayn't have been obstructing
you mayn't have been obstructing
she mayn't have been obstructing
we mayn't have been obstructing
you mayn't have been obstructing
they mayn't have been obstructing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I obstruct?
may you obstruct?
may she obstruct?
may we obstruct?
may you obstruct?
may they obstruct? 	may I be obstructing?
may you be obstructing?
may she be obstructing?
may we be obstructing?
may you be obstructing?
may they be obstructing? 	may I have obstructed?
may you have obstructed?
may she have obstructed?
may we have obstructed?
may you have obstructed?
may they have obstructed? 	may I have been obstructing?
may you have been obstructing?
may she have been obstructing?
may we have been obstructing?
may you have been obstructing?
may they have been obstructing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I obstruct?
mayn't you obstruct?
mayn't she obstruct?
mayn't we obstruct?
mayn't you obstruct?
mayn't they obstruct? 	mayn't I be obstructing?
mayn't you be obstructing?
mayn't she be obstructing?
mayn't we be obstructing?
mayn't you be obstructing?
mayn't they be obstructing? 	mayn't I have obstructed?
mayn't you have obstructed?
mayn't she have obstructed?
mayn't we have obstructed?
mayn't you have obstructed?
mayn't they have obstructed? 	mayn't I have been obstructing?
mayn't you have been obstructing?
mayn't she have been obstructing?
mayn't we have been obstructing?
mayn't you have been obstructing?
mayn't they have been obstructing?