must decussate
Regular verb: decussate - decussated- decussated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must decussate
you must decussate
she must decussate
we must decussate
you must decussate
they must decussate 	I must be decussating
you must be decussating
she must be decussating
we must be decussating
you must be decussating
they must be decussating	I must have decussated
you must have decussated
she must have decussated
we must have decussated
you must have decussated
they must have decussated	I must have been decussating
you must have been decussating
she must have been decussating
we must have been decussating
you must have been decussating
they must have been decussating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't decussate
you mustn't decussate
she mustn't decussate
we mustn't decussate
you mustn't decussate
they mustn't decussate 	I mustn't be decussating
you mustn't be decussating
she mustn't be decussating
we mustn't be decussating
you mustn't be decussating
they mustn't be decussating	I mustn't have decussated
you mustn't have decussated
she mustn't have decussated
we mustn't have decussated
you mustn't have decussated
they mustn't have decussated	I mustn't have been decussating
you mustn't have been decussating
she mustn't have been decussating
we mustn't have been decussating
you mustn't have been decussating
they mustn't have been decussating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I decussate?
must you decussate?
must she decussate?
must we decussate?
must you decussate?
must they decussate? 	must I be decussating?
must you be decussating?
must she be decussating?
must we be decussating?
must you be decussating?
must they be decussating? 	must I have decussated?
must you have decussated?
must she have decussated?
must we have decussated?
must you have decussated?
must they have decussated? 	must I have been decussating?
must you have been decussating?
must she have been decussating?
must we have been decussating?
must you have been decussating?
must they have been decussating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I decussate?
mustn't you decussate?
mustn't she decussate?
mustn't we decussate?
mustn't you decussate?
mustn't they decussate? 	mustn't I be decussating?
mustn't you be decussating?
mustn't she be decussating?
mustn't we be decussating?
mustn't you be decussating?
mustn't they be decussating? 	mustn't I have decussated?
mustn't you have decussated?
mustn't she have decussated?
mustn't we have decussated?
mustn't you have decussated?
mustn't they have decussated? 	mustn't I have been decussating?
mustn't you have been decussating?
mustn't she have been decussating?
mustn't we have been decussating?
mustn't you have been decussating?
mustn't they have been decussating?