must harbour
Regular verb: harbour - harboured- harboured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must harbour
you must harbour
he must harbour
we must harbour
you must harbour
they must harbour 	I must be harbouring
you must be harbouring
he must be harbouring
we must be harbouring
you must be harbouring
they must be harbouring	I must have harboured
you must have harboured
he must have harboured
we must have harboured
you must have harboured
they must have harboured	I must have been harbouring
you must have been harbouring
he must have been harbouring
we must have been harbouring
you must have been harbouring
they must have been harbouring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not harbour
you must not harbour
he must not harbour
we must not harbour
you must not harbour
they must not harbour 	I must not be harbouring
you must not be harbouring
he must not be harbouring
we must not be harbouring
you must not be harbouring
they must not be harbouring	I must not have harboured
you must not have harboured
he must not have harboured
we must not have harboured
you must not have harboured
they must not have harboured	I must not have been harbouring
you must not have been harbouring
he must not have been harbouring
we must not have been harbouring
you must not have been harbouring
they must not have been harbouring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I harbour?
must you harbour?
must he harbour?
must we harbour?
must you harbour?
must they harbour? 	must I be harbouring?
must you be harbouring?
must he be harbouring?
must we be harbouring?
must you be harbouring?
must they be harbouring? 	must I have harboured?
must you have harboured?
must he have harboured?
must we have harboured?
must you have harboured?
must they have harboured? 	must I have been harbouring?
must you have been harbouring?
must he have been harbouring?
must we have been harbouring?
must you have been harbouring?
must they have been harbouring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not harbour?
must you not harbour?
must he not harbour?
must we not harbour?
must you not harbour?
must they not harbour? 	must I not be harbouring?
must you not be harbouring?
must he not be harbouring?
must we not be harbouring?
must you not be harbouring?
must they not be harbouring? 	must I not have harboured?
must you not have harboured?
must he not have harboured?
must we not have harboured?
must you not have harboured?
must they not have harboured? 	must I not have been harbouring?
must you not have been harbouring?
must he not have been harbouring?
must we not have been harbouring?
must you not have been harbouring?
must they not have been harbouring?