must cull
Regular verb: cull - culled- culled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cull
you must cull
she must cull
we must cull
you must cull
they must cull 	I must be culling
you must be culling
she must be culling
we must be culling
you must be culling
they must be culling	I must have culled
you must have culled
she must have culled
we must have culled
you must have culled
they must have culled	I must have been culling
you must have been culling
she must have been culling
we must have been culling
you must have been culling
they must have been culling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't cull
you mustn't cull
she mustn't cull
we mustn't cull
you mustn't cull
they mustn't cull 	I mustn't be culling
you mustn't be culling
she mustn't be culling
we mustn't be culling
you mustn't be culling
they mustn't be culling	I mustn't have culled
you mustn't have culled
she mustn't have culled
we mustn't have culled
you mustn't have culled
they mustn't have culled	I mustn't have been culling
you mustn't have been culling
she mustn't have been culling
we mustn't have been culling
you mustn't have been culling
they mustn't have been culling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cull?
must you cull?
must she cull?
must we cull?
must you cull?
must they cull? 	must I be culling?
must you be culling?
must she be culling?
must we be culling?
must you be culling?
must they be culling? 	must I have culled?
must you have culled?
must she have culled?
must we have culled?
must you have culled?
must they have culled? 	must I have been culling?
must you have been culling?
must she have been culling?
must we have been culling?
must you have been culling?
must they have been culling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I cull?
mustn't you cull?
mustn't she cull?
mustn't we cull?
mustn't you cull?
mustn't they cull? 	mustn't I be culling?
mustn't you be culling?
mustn't she be culling?
mustn't we be culling?
mustn't you be culling?
mustn't they be culling? 	mustn't I have culled?
mustn't you have culled?
mustn't she have culled?
mustn't we have culled?
mustn't you have culled?
mustn't they have culled? 	mustn't I have been culling?
mustn't you have been culling?
mustn't she have been culling?
mustn't we have been culling?
mustn't you have been culling?
mustn't they have been culling?