must gainsay
Irregular verb: gainsay - gainsaid- gainsaid

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gainsay
you must gainsay
he must gainsay
we must gainsay
you must gainsay
they must gainsay 	I must be gainsaying
you must be gainsaying
he must be gainsaying
we must be gainsaying
you must be gainsaying
they must be gainsaying	I must have gainsaid
you must have gainsaid
he must have gainsaid
we must have gainsaid
you must have gainsaid
they must have gainsaid	I must have been gainsaying
you must have been gainsaying
he must have been gainsaying
we must have been gainsaying
you must have been gainsaying
they must have been gainsaying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gainsay
you mustn't gainsay
he mustn't gainsay
we mustn't gainsay
you mustn't gainsay
they mustn't gainsay 	I mustn't be gainsaying
you mustn't be gainsaying
he mustn't be gainsaying
we mustn't be gainsaying
you mustn't be gainsaying
they mustn't be gainsaying	I mustn't have gainsaid
you mustn't have gainsaid
he mustn't have gainsaid
we mustn't have gainsaid
you mustn't have gainsaid
they mustn't have gainsaid	I mustn't have been gainsaying
you mustn't have been gainsaying
he mustn't have been gainsaying
we mustn't have been gainsaying
you mustn't have been gainsaying
they mustn't have been gainsaying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gainsay?
must you gainsay?
must he gainsay?
must we gainsay?
must you gainsay?
must they gainsay? 	must I be gainsaying?
must you be gainsaying?
must he be gainsaying?
must we be gainsaying?
must you be gainsaying?
must they be gainsaying? 	must I have gainsaid?
must you have gainsaid?
must he have gainsaid?
must we have gainsaid?
must you have gainsaid?
must they have gainsaid? 	must I have been gainsaying?
must you have been gainsaying?
must he have been gainsaying?
must we have been gainsaying?
must you have been gainsaying?
must they have been gainsaying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gainsay?
mustn't you gainsay?
mustn't he gainsay?
mustn't we gainsay?
mustn't you gainsay?
mustn't they gainsay? 	mustn't I be gainsaying?
mustn't you be gainsaying?
mustn't he be gainsaying?
mustn't we be gainsaying?
mustn't you be gainsaying?
mustn't they be gainsaying? 	mustn't I have gainsaid?
mustn't you have gainsaid?
mustn't he have gainsaid?
mustn't we have gainsaid?
mustn't you have gainsaid?
mustn't they have gainsaid? 	mustn't I have been gainsaying?
mustn't you have been gainsaying?
mustn't he have been gainsaying?
mustn't we have been gainsaying?
mustn't you have been gainsaying?
mustn't they have been gainsaying?