must strike
Irregular verb: strike - struck- struck, stricken

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must strike
you must strike
he must strike
we must strike
you must strike
they must strike 	I must be striking
you must be striking
he must be striking
we must be striking
you must be striking
they must be striking	I must have struck, stricken
you must have struck, stricken
he must have struck, stricken
we must have struck, stricken
you must have struck, stricken
they must have struck, stricken	I must have been striking
you must have been striking
he must have been striking
we must have been striking
you must have been striking
they must have been striking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't strike
you mustn't strike
he mustn't strike
we mustn't strike
you mustn't strike
they mustn't strike 	I mustn't be striking
you mustn't be striking
he mustn't be striking
we mustn't be striking
you mustn't be striking
they mustn't be striking	I mustn't have struck, stricken
you mustn't have struck, stricken
he mustn't have struck, stricken
we mustn't have struck, stricken
you mustn't have struck, stricken
they mustn't have struck, stricken	I mustn't have been striking
you mustn't have been striking
he mustn't have been striking
we mustn't have been striking
you mustn't have been striking
they mustn't have been striking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I strike?
must you strike?
must he strike?
must we strike?
must you strike?
must they strike? 	must I be striking?
must you be striking?
must he be striking?
must we be striking?
must you be striking?
must they be striking? 	must I have struck, stricken?
must you have struck, stricken?
must he have struck, stricken?
must we have struck, stricken?
must you have struck, stricken?
must they have struck, stricken? 	must I have been striking?
must you have been striking?
must he have been striking?
must we have been striking?
must you have been striking?
must they have been striking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I strike?
mustn't you strike?
mustn't he strike?
mustn't we strike?
mustn't you strike?
mustn't they strike? 	mustn't I be striking?
mustn't you be striking?
mustn't he be striking?
mustn't we be striking?
mustn't you be striking?
mustn't they be striking? 	mustn't I have struck, stricken?
mustn't you have struck, stricken?
mustn't he have struck, stricken?
mustn't we have struck, stricken?
mustn't you have struck, stricken?
mustn't they have struck, stricken? 	mustn't I have been striking?
mustn't you have been striking?
mustn't he have been striking?
mustn't we have been striking?
mustn't you have been striking?
mustn't they have been striking?