can mull
Regular verb: mull - mulled- mulled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can mull
you can mull
he can mull
we can mull
you can mull
they can mull 	I can be mulling
you can be mulling
he can be mulling
we can be mulling
you can be mulling
they can be mulling	I can have mulled
you can have mulled
he can have mulled
we can have mulled
you can have mulled
they can have mulled	I can have been mulling
you can have been mulling
he can have been mulling
we can have been mulling
you can have been mulling
they can have been mulling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't mull
you can't mull
he can't mull
we can't mull
you can't mull
they can't mull 	I can't be mulling
you can't be mulling
he can't be mulling
we can't be mulling
you can't be mulling
they can't be mulling	I can't have mulled
you can't have mulled
he can't have mulled
we can't have mulled
you can't have mulled
they can't have mulled	I can't have been mulling
you can't have been mulling
he can't have been mulling
we can't have been mulling
you can't have been mulling
they can't have been mulling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I mull?
can you mull?
can he mull?
can we mull?
can you mull?
can they mull? 	can I be mulling?
can you be mulling?
can he be mulling?
can we be mulling?
can you be mulling?
can they be mulling? 	can I have mulled?
can you have mulled?
can he have mulled?
can we have mulled?
can you have mulled?
can they have mulled? 	can I have been mulling?
can you have been mulling?
can he have been mulling?
can we have been mulling?
can you have been mulling?
can they have been mulling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I mull?
can't you mull?
can't he mull?
can't we mull?
can't you mull?
can't they mull? 	can't I be mulling?
can't you be mulling?
can't he be mulling?
can't we be mulling?
can't you be mulling?
can't they be mulling? 	can't I have mulled?
can't you have mulled?
can't he have mulled?
can't we have mulled?
can't you have mulled?
can't they have mulled? 	can't I have been mulling?
can't you have been mulling?
can't he have been mulling?
can't we have been mulling?
can't you have been mulling?
can't they have been mulling?