must pin
Regular verb: pin - pinned- pinned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pin
you must pin
he must pin
we must pin
you must pin
they must pin 	I must be pinning
you must be pinning
he must be pinning
we must be pinning
you must be pinning
they must be pinning	I must have pinned
you must have pinned
he must have pinned
we must have pinned
you must have pinned
they must have pinned	I must have been pinning
you must have been pinning
he must have been pinning
we must have been pinning
you must have been pinning
they must have been pinning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not pin
you must not pin
he must not pin
we must not pin
you must not pin
they must not pin 	I must not be pinning
you must not be pinning
he must not be pinning
we must not be pinning
you must not be pinning
they must not be pinning	I must not have pinned
you must not have pinned
he must not have pinned
we must not have pinned
you must not have pinned
they must not have pinned	I must not have been pinning
you must not have been pinning
he must not have been pinning
we must not have been pinning
you must not have been pinning
they must not have been pinning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pin?
must you pin?
must he pin?
must we pin?
must you pin?
must they pin? 	must I be pinning?
must you be pinning?
must he be pinning?
must we be pinning?
must you be pinning?
must they be pinning? 	must I have pinned?
must you have pinned?
must he have pinned?
must we have pinned?
must you have pinned?
must they have pinned? 	must I have been pinning?
must you have been pinning?
must he have been pinning?
must we have been pinning?
must you have been pinning?
must they have been pinning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not pin?
must you not pin?
must he not pin?
must we not pin?
must you not pin?
must they not pin? 	must I not be pinning?
must you not be pinning?
must he not be pinning?
must we not be pinning?
must you not be pinning?
must they not be pinning? 	must I not have pinned?
must you not have pinned?
must he not have pinned?
must we not have pinned?
must you not have pinned?
must they not have pinned? 	must I not have been pinning?
must you not have been pinning?
must he not have been pinning?
must we not have been pinning?
must you not have been pinning?
must they not have been pinning?