must darn
Regular verb: darn - darned- darned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must darn
you must darn
he must darn
we must darn
you must darn
they must darn 	I must be darning
you must be darning
he must be darning
we must be darning
you must be darning
they must be darning	I must have darned
you must have darned
he must have darned
we must have darned
you must have darned
they must have darned	I must have been darning
you must have been darning
he must have been darning
we must have been darning
you must have been darning
they must have been darning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not darn
you must not darn
he must not darn
we must not darn
you must not darn
they must not darn 	I must not be darning
you must not be darning
he must not be darning
we must not be darning
you must not be darning
they must not be darning	I must not have darned
you must not have darned
he must not have darned
we must not have darned
you must not have darned
they must not have darned	I must not have been darning
you must not have been darning
he must not have been darning
we must not have been darning
you must not have been darning
they must not have been darning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I darn?
must you darn?
must he darn?
must we darn?
must you darn?
must they darn? 	must I be darning?
must you be darning?
must he be darning?
must we be darning?
must you be darning?
must they be darning? 	must I have darned?
must you have darned?
must he have darned?
must we have darned?
must you have darned?
must they have darned? 	must I have been darning?
must you have been darning?
must he have been darning?
must we have been darning?
must you have been darning?
must they have been darning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not darn?
must you not darn?
must he not darn?
must we not darn?
must you not darn?
must they not darn? 	must I not be darning?
must you not be darning?
must he not be darning?
must we not be darning?
must you not be darning?
must they not be darning? 	must I not have darned?
must you not have darned?
must he not have darned?
must we not have darned?
must you not have darned?
must they not have darned? 	must I not have been darning?
must you not have been darning?
must he not have been darning?
must we not have been darning?
must you not have been darning?
must they not have been darning?