must obstruct
Verbe régulier : obstruct - obstructed- obstructed
Traduction française : bloquer - faire obstruction ou obstacle à 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must obstruct
you must obstruct
she must obstruct
we must obstruct
you must obstruct
they must obstruct 	I must be obstructing
you must be obstructing
she must be obstructing
we must be obstructing
you must be obstructing
they must be obstructing	I must have obstructed
you must have obstructed
she must have obstructed
we must have obstructed
you must have obstructed
they must have obstructed	I must have been obstructing
you must have been obstructing
she must have been obstructing
we must have been obstructing
you must have been obstructing
they must have been obstructing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not obstruct
you must not obstruct
she must not obstruct
we must not obstruct
you must not obstruct
they must not obstruct 	I must not be obstructing
you must not be obstructing
she must not be obstructing
we must not be obstructing
you must not be obstructing
they must not be obstructing	I must not have obstructed
you must not have obstructed
she must not have obstructed
we must not have obstructed
you must not have obstructed
they must not have obstructed	I must not have been obstructing
you must not have been obstructing
she must not have been obstructing
we must not have been obstructing
you must not have been obstructing
they must not have been obstructing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I obstruct?
must you obstruct?
must she obstruct?
must we obstruct?
must you obstruct?
must they obstruct? 	must I be obstructing?
must you be obstructing?
must she be obstructing?
must we be obstructing?
must you be obstructing?
must they be obstructing? 	must I have obstructed?
must you have obstructed?
must she have obstructed?
must we have obstructed?
must you have obstructed?
must they have obstructed? 	must I have been obstructing?
must you have been obstructing?
must she have been obstructing?
must we have been obstructing?
must you have been obstructing?
must they have been obstructing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not obstruct?
must you not obstruct?
must she not obstruct?
must we not obstruct?
must you not obstruct?
must they not obstruct? 	must I not be obstructing?
must you not be obstructing?
must she not be obstructing?
must we not be obstructing?
must you not be obstructing?
must they not be obstructing? 	must I not have obstructed?
must you not have obstructed?
must she not have obstructed?
must we not have obstructed?
must you not have obstructed?
must they not have obstructed? 	must I not have been obstructing?
must you not have been obstructing?
must she not have been obstructing?
must we not have been obstructing?
must you not have been obstructing?
must they not have been obstructing?