must harm
Regular verb: harm - harmed- harmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must harm
you must harm
he must harm
we must harm
you must harm
they must harm 	I must be harming
you must be harming
he must be harming
we must be harming
you must be harming
they must be harming	I must have harmed
you must have harmed
he must have harmed
we must have harmed
you must have harmed
they must have harmed	I must have been harming
you must have been harming
he must have been harming
we must have been harming
you must have been harming
they must have been harming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not harm
you must not harm
he must not harm
we must not harm
you must not harm
they must not harm 	I must not be harming
you must not be harming
he must not be harming
we must not be harming
you must not be harming
they must not be harming	I must not have harmed
you must not have harmed
he must not have harmed
we must not have harmed
you must not have harmed
they must not have harmed	I must not have been harming
you must not have been harming
he must not have been harming
we must not have been harming
you must not have been harming
they must not have been harming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I harm?
must you harm?
must he harm?
must we harm?
must you harm?
must they harm? 	must I be harming?
must you be harming?
must he be harming?
must we be harming?
must you be harming?
must they be harming? 	must I have harmed?
must you have harmed?
must he have harmed?
must we have harmed?
must you have harmed?
must they have harmed? 	must I have been harming?
must you have been harming?
must he have been harming?
must we have been harming?
must you have been harming?
must they have been harming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not harm?
must you not harm?
must he not harm?
must we not harm?
must you not harm?
must they not harm? 	must I not be harming?
must you not be harming?
must he not be harming?
must we not be harming?
must you not be harming?
must they not be harming? 	must I not have harmed?
must you not have harmed?
must he not have harmed?
must we not have harmed?
must you not have harmed?
must they not have harmed? 	must I not have been harming?
must you not have been harming?
must he not have been harming?
must we not have been harming?
must you not have been harming?
must they not have been harming?