must harp
Regular verb: harp - harped- harped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must harp
you must harp
she must harp
we must harp
you must harp
they must harp 	I must be harping
you must be harping
she must be harping
we must be harping
you must be harping
they must be harping	I must have harped
you must have harped
she must have harped
we must have harped
you must have harped
they must have harped	I must have been harping
you must have been harping
she must have been harping
we must have been harping
you must have been harping
they must have been harping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not harp
you must not harp
she must not harp
we must not harp
you must not harp
they must not harp 	I must not be harping
you must not be harping
she must not be harping
we must not be harping
you must not be harping
they must not be harping	I must not have harped
you must not have harped
she must not have harped
we must not have harped
you must not have harped
they must not have harped	I must not have been harping
you must not have been harping
she must not have been harping
we must not have been harping
you must not have been harping
they must not have been harping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I harp?
must you harp?
must she harp?
must we harp?
must you harp?
must they harp? 	must I be harping?
must you be harping?
must she be harping?
must we be harping?
must you be harping?
must they be harping? 	must I have harped?
must you have harped?
must she have harped?
must we have harped?
must you have harped?
must they have harped? 	must I have been harping?
must you have been harping?
must she have been harping?
must we have been harping?
must you have been harping?
must they have been harping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not harp?
must you not harp?
must she not harp?
must we not harp?
must you not harp?
must they not harp? 	must I not be harping?
must you not be harping?
must she not be harping?
must we not be harping?
must you not be harping?
must they not be harping? 	must I not have harped?
must you not have harped?
must she not have harped?
must we not have harped?
must you not have harped?
must they not have harped? 	must I not have been harping?
must you not have been harping?
must she not have been harping?
must we not have been harping?
must you not have been harping?
must they not have been harping?