must skip
Regular verb: skip - skipped- skipped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must skip
you must skip
she must skip
we must skip
you must skip
they must skip 	I must be skipping
you must be skipping
she must be skipping
we must be skipping
you must be skipping
they must be skipping	I must have skipped
you must have skipped
she must have skipped
we must have skipped
you must have skipped
they must have skipped	I must have been skipping
you must have been skipping
she must have been skipping
we must have been skipping
you must have been skipping
they must have been skipping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't skip
you mustn't skip
she mustn't skip
we mustn't skip
you mustn't skip
they mustn't skip 	I mustn't be skipping
you mustn't be skipping
she mustn't be skipping
we mustn't be skipping
you mustn't be skipping
they mustn't be skipping	I mustn't have skipped
you mustn't have skipped
she mustn't have skipped
we mustn't have skipped
you mustn't have skipped
they mustn't have skipped	I mustn't have been skipping
you mustn't have been skipping
she mustn't have been skipping
we mustn't have been skipping
you mustn't have been skipping
they mustn't have been skipping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I skip?
must you skip?
must she skip?
must we skip?
must you skip?
must they skip? 	must I be skipping?
must you be skipping?
must she be skipping?
must we be skipping?
must you be skipping?
must they be skipping? 	must I have skipped?
must you have skipped?
must she have skipped?
must we have skipped?
must you have skipped?
must they have skipped? 	must I have been skipping?
must you have been skipping?
must she have been skipping?
must we have been skipping?
must you have been skipping?
must they have been skipping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I skip?
mustn't you skip?
mustn't she skip?
mustn't we skip?
mustn't you skip?
mustn't they skip? 	mustn't I be skipping?
mustn't you be skipping?
mustn't she be skipping?
mustn't we be skipping?
mustn't you be skipping?
mustn't they be skipping? 	mustn't I have skipped?
mustn't you have skipped?
mustn't she have skipped?
mustn't we have skipped?
mustn't you have skipped?
mustn't they have skipped? 	mustn't I have been skipping?
mustn't you have been skipping?
mustn't she have been skipping?
mustn't we have been skipping?
mustn't you have been skipping?
mustn't they have been skipping?