can overstaff
Regular verb: overstaff - overstaffed- overstaffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can overstaff
you can overstaff
he can overstaff
we can overstaff
you can overstaff
they can overstaff 	I can be overstaffing
you can be overstaffing
he can be overstaffing
we can be overstaffing
you can be overstaffing
they can be overstaffing	I can have overstaffed
you can have overstaffed
he can have overstaffed
we can have overstaffed
you can have overstaffed
they can have overstaffed	I can have been overstaffing
you can have been overstaffing
he can have been overstaffing
we can have been overstaffing
you can have been overstaffing
they can have been overstaffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't overstaff
you can't overstaff
he can't overstaff
we can't overstaff
you can't overstaff
they can't overstaff 	I can't be overstaffing
you can't be overstaffing
he can't be overstaffing
we can't be overstaffing
you can't be overstaffing
they can't be overstaffing	I can't have overstaffed
you can't have overstaffed
he can't have overstaffed
we can't have overstaffed
you can't have overstaffed
they can't have overstaffed	I can't have been overstaffing
you can't have been overstaffing
he can't have been overstaffing
we can't have been overstaffing
you can't have been overstaffing
they can't have been overstaffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I overstaff?
can you overstaff?
can he overstaff?
can we overstaff?
can you overstaff?
can they overstaff? 	can I be overstaffing?
can you be overstaffing?
can he be overstaffing?
can we be overstaffing?
can you be overstaffing?
can they be overstaffing? 	can I have overstaffed?
can you have overstaffed?
can he have overstaffed?
can we have overstaffed?
can you have overstaffed?
can they have overstaffed? 	can I have been overstaffing?
can you have been overstaffing?
can he have been overstaffing?
can we have been overstaffing?
can you have been overstaffing?
can they have been overstaffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I overstaff?
can't you overstaff?
can't he overstaff?
can't we overstaff?
can't you overstaff?
can't they overstaff? 	can't I be overstaffing?
can't you be overstaffing?
can't he be overstaffing?
can't we be overstaffing?
can't you be overstaffing?
can't they be overstaffing? 	can't I have overstaffed?
can't you have overstaffed?
can't he have overstaffed?
can't we have overstaffed?
can't you have overstaffed?
can't they have overstaffed? 	can't I have been overstaffing?
can't you have been overstaffing?
can't he have been overstaffing?
can't we have been overstaffing?
can't you have been overstaffing?
can't they have been overstaffing?