must crush
Regular verb: crush - crushed- crushed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must crush
you must crush
she must crush
we must crush
you must crush
they must crush 	I must be crushing
you must be crushing
she must be crushing
we must be crushing
you must be crushing
they must be crushing	I must have crushed
you must have crushed
she must have crushed
we must have crushed
you must have crushed
they must have crushed	I must have been crushing
you must have been crushing
she must have been crushing
we must have been crushing
you must have been crushing
they must have been crushing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't crush
you mustn't crush
she mustn't crush
we mustn't crush
you mustn't crush
they mustn't crush 	I mustn't be crushing
you mustn't be crushing
she mustn't be crushing
we mustn't be crushing
you mustn't be crushing
they mustn't be crushing	I mustn't have crushed
you mustn't have crushed
she mustn't have crushed
we mustn't have crushed
you mustn't have crushed
they mustn't have crushed	I mustn't have been crushing
you mustn't have been crushing
she mustn't have been crushing
we mustn't have been crushing
you mustn't have been crushing
they mustn't have been crushing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I crush?
must you crush?
must she crush?
must we crush?
must you crush?
must they crush? 	must I be crushing?
must you be crushing?
must she be crushing?
must we be crushing?
must you be crushing?
must they be crushing? 	must I have crushed?
must you have crushed?
must she have crushed?
must we have crushed?
must you have crushed?
must they have crushed? 	must I have been crushing?
must you have been crushing?
must she have been crushing?
must we have been crushing?
must you have been crushing?
must they have been crushing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I crush?
mustn't you crush?
mustn't she crush?
mustn't we crush?
mustn't you crush?
mustn't they crush? 	mustn't I be crushing?
mustn't you be crushing?
mustn't she be crushing?
mustn't we be crushing?
mustn't you be crushing?
mustn't they be crushing? 	mustn't I have crushed?
mustn't you have crushed?
mustn't she have crushed?
mustn't we have crushed?
mustn't you have crushed?
mustn't they have crushed? 	mustn't I have been crushing?
mustn't you have been crushing?
mustn't she have been crushing?
mustn't we have been crushing?
mustn't you have been crushing?
mustn't they have been crushing?