must tether
Regular verb: tether - tethered- tethered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must tether
you must tether
he must tether
we must tether
you must tether
they must tether 	I must be tethering
you must be tethering
he must be tethering
we must be tethering
you must be tethering
they must be tethering	I must have tethered
you must have tethered
he must have tethered
we must have tethered
you must have tethered
they must have tethered	I must have been tethering
you must have been tethering
he must have been tethering
we must have been tethering
you must have been tethering
they must have been tethering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not tether
you must not tether
he must not tether
we must not tether
you must not tether
they must not tether 	I must not be tethering
you must not be tethering
he must not be tethering
we must not be tethering
you must not be tethering
they must not be tethering	I must not have tethered
you must not have tethered
he must not have tethered
we must not have tethered
you must not have tethered
they must not have tethered	I must not have been tethering
you must not have been tethering
he must not have been tethering
we must not have been tethering
you must not have been tethering
they must not have been tethering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I tether?
must you tether?
must he tether?
must we tether?
must you tether?
must they tether? 	must I be tethering?
must you be tethering?
must he be tethering?
must we be tethering?
must you be tethering?
must they be tethering? 	must I have tethered?
must you have tethered?
must he have tethered?
must we have tethered?
must you have tethered?
must they have tethered? 	must I have been tethering?
must you have been tethering?
must he have been tethering?
must we have been tethering?
must you have been tethering?
must they have been tethering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not tether?
must you not tether?
must he not tether?
must we not tether?
must you not tether?
must they not tether? 	must I not be tethering?
must you not be tethering?
must he not be tethering?
must we not be tethering?
must you not be tethering?
must they not be tethering? 	must I not have tethered?
must you not have tethered?
must he not have tethered?
must we not have tethered?
must you not have tethered?
must they not have tethered? 	must I not have been tethering?
must you not have been tethering?
must he not have been tethering?
must we not have been tethering?
must you not have been tethering?
must they not have been tethering?