I can lump you can lump he can lump we can lump you can lump they can lump
V-ing form
I can be lumping you can be lumping he can be lumping we can be lumping you can be lumping they can be lumping
Perfect
I can have lumped you can have lumped he can have lumped we can have lumped you can have lumped they can have lumped
V-ing perfect
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
I cannot lump you cannot lump he cannot lump we cannot lump you cannot lump they cannot lump
V-ing form
I cannot be lumping you cannot be lumping he cannot be lumping we cannot be lumping you cannot be lumping they cannot be lumping
Perfect
I cannot have lumped you cannot have lumped he cannot have lumped we cannot have lumped you cannot have lumped they cannot have lumped
V-ing perfect
I cannot have been lumping you cannot have been lumping he cannot have been lumping we cannot have been lumping you cannot have been lumping they cannot have been lumping
Interrogative form
Simple form
can I lump? can you lump? can he lump? can we lump? can you lump? can they lump?
V-ing form
can I be lumping? can you be lumping? can he be lumping? can we be lumping? can you be lumping? can they be lumping?
Perfect
can I have lumped? can you have lumped? can he have lumped? can we have lumped? can you have lumped? can they have lumped?
V-ing perfect
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
can I not lump? can you not lump? can he not lump? can we not lump? can you not lump? can they not lump?
V-ing form
can I not be lumping? can you not be lumping? can he not be lumping? can we not be lumping? can you not be lumping? can they not be lumping?
Perfect
can I not have lumped? can you not have lumped? can he not have lumped? can we not have lumped? can you not have lumped? can they not have lumped?
V-ing perfect
can I not have been lumping? can you not have been lumping? can he not have been lumping? can we not have been lumping? can you not have been lumping? can they not have been lumping?