must skim
Regular verb: skim - skimmed- skimmed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must skim
you must skim
he must skim
we must skim
you must skim
they must skim 	I must be skimming
you must be skimming
he must be skimming
we must be skimming
you must be skimming
they must be skimming	I must have skimmed
you must have skimmed
he must have skimmed
we must have skimmed
you must have skimmed
they must have skimmed	I must have been skimming
you must have been skimming
he must have been skimming
we must have been skimming
you must have been skimming
they must have been skimming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not skim
you must not skim
he must not skim
we must not skim
you must not skim
they must not skim 	I must not be skimming
you must not be skimming
he must not be skimming
we must not be skimming
you must not be skimming
they must not be skimming	I must not have skimmed
you must not have skimmed
he must not have skimmed
we must not have skimmed
you must not have skimmed
they must not have skimmed	I must not have been skimming
you must not have been skimming
he must not have been skimming
we must not have been skimming
you must not have been skimming
they must not have been skimming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I skim?
must you skim?
must he skim?
must we skim?
must you skim?
must they skim? 	must I be skimming?
must you be skimming?
must he be skimming?
must we be skimming?
must you be skimming?
must they be skimming? 	must I have skimmed?
must you have skimmed?
must he have skimmed?
must we have skimmed?
must you have skimmed?
must they have skimmed? 	must I have been skimming?
must you have been skimming?
must he have been skimming?
must we have been skimming?
must you have been skimming?
must they have been skimming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not skim?
must you not skim?
must he not skim?
must we not skim?
must you not skim?
must they not skim? 	must I not be skimming?
must you not be skimming?
must he not be skimming?
must we not be skimming?
must you not be skimming?
must they not be skimming? 	must I not have skimmed?
must you not have skimmed?
must he not have skimmed?
must we not have skimmed?
must you not have skimmed?
must they not have skimmed? 	must I not have been skimming?
must you not have been skimming?
must he not have been skimming?
must we not have been skimming?
must you not have been skimming?
must they not have been skimming?