can lump
Regular verb: lump - lumped- lumped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can lump
you can lump
he can lump
we can lump
you can lump
they can lump 	I can be lumping
you can be lumping
he can be lumping
we can be lumping
you can be lumping
they can be lumping	I can have lumped
you can have lumped
he can have lumped
we can have lumped
you can have lumped
they can have lumped	I can have been lumping
you can have been lumping
he can have been lumping
we can have been lumping
you can have been lumping
they can have been lumping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't lump
you can't lump
he can't lump
we can't lump
you can't lump
they can't lump 	I can't be lumping
you can't be lumping
he can't be lumping
we can't be lumping
you can't be lumping
they can't be lumping	I can't have lumped
you can't have lumped
he can't have lumped
we can't have lumped
you can't have lumped
they can't have lumped	I can't have been lumping
you can't have been lumping
he can't have been lumping
we can't have been lumping
you can't have been lumping
they can't have been lumping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I lump?
can you lump?
can he lump?
can we lump?
can you lump?
can they lump? 	can I be lumping?
can you be lumping?
can he be lumping?
can we be lumping?
can you be lumping?
can they be lumping? 	can I have lumped?
can you have lumped?
can he have lumped?
can we have lumped?
can you have lumped?
can they have lumped? 	can I have been lumping?
can you have been lumping?
can he have been lumping?
can we have been lumping?
can you have been lumping?
can they have been lumping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I lump?
can't you lump?
can't he lump?
can't we lump?
can't you lump?
can't they lump? 	can't I be lumping?
can't you be lumping?
can't he be lumping?
can't we be lumping?
can't you be lumping?
can't they be lumping? 	can't I have lumped?
can't you have lumped?
can't he have lumped?
can't we have lumped?
can't you have lumped?
can't they have lumped? 	can't I have been lumping?
can't you have been lumping?
can't he have been lumping?
can't we have been lumping?
can't you have been lumping?
can't they have been lumping?