shall overbill
Regular verb: overbill - overbilled- overbilled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'll overbill
you'll overbill
he'll overbill
we'll overbill
you'll overbill
they'll overbill 	I'll be overbilling
you'll be overbilling
he'll be overbilling
we'll be overbilling
you'll be overbilling
they'll be overbilling	I'll have overbilled
you'll have overbilled
he'll have overbilled
we'll have overbilled
you'll have overbilled
they'll have overbilled	I'll have been overbilling
you'll have been overbilling
he'll have been overbilling
we'll have been overbilling
you'll have been overbilling
they'll have been overbilling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shan't overbill
you shan't overbill
he shan't overbill
we shan't overbill
you shan't overbill
they shan't overbill 	I shan't be overbilling
you shan't be overbilling
he shan't be overbilling
we shan't be overbilling
you shan't be overbilling
they shan't be overbilling	I shan't have overbilled
you shan't have overbilled
he shan't have overbilled
we shan't have overbilled
you shan't have overbilled
they shan't have overbilled	I shan't have been overbilling
you shan't have been overbilling
he shan't have been overbilling
we shan't have been overbilling
you shan't have been overbilling
they shan't have been overbilling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shall I overbill?
shall you overbill?
shall he overbill?
shall we overbill?
shall you overbill?
shall they overbill? 	shall I be overbilling?
shall you be overbilling?
shall he be overbilling?
shall we be overbilling?
shall you be overbilling?
shall they be overbilling? 	shall I have overbilled?
shall you have overbilled?
shall he have overbilled?
shall we have overbilled?
shall you have overbilled?
shall they have overbilled? 	shall I have been overbilling?
shall you have been overbilling?
shall he have been overbilling?
shall we have been overbilling?
shall you have been overbilling?
shall they have been overbilling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shan't I overbill?
shan't you overbill?
shan't he overbill?
shan't we overbill?
shan't you overbill?
shan't they overbill? 	shan't I be overbilling?
shan't you be overbilling?
shan't he be overbilling?
shan't we be overbilling?
shan't you be overbilling?
shan't they be overbilling? 	shan't I have overbilled?
shan't you have overbilled?
shan't he have overbilled?
shan't we have overbilled?
shan't you have overbilled?
shan't they have overbilled? 	shan't I have been overbilling?
shan't you have been overbilling?
shan't he have been overbilling?
shan't we have been overbilling?
shan't you have been overbilling?
shan't they have been overbilling?