could overbook
Regular verb: overbook - overbooked- overbooked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could overbook
you could overbook
she could overbook
we could overbook
you could overbook
they could overbook 	I could be overbooking
you could be overbooking
she could be overbooking
we could be overbooking
you could be overbooking
they could be overbooking	I could have overbooked
you could have overbooked
she could have overbooked
we could have overbooked
you could have overbooked
they could have overbooked	I could have been overbooking
you could have been overbooking
she could have been overbooking
we could have been overbooking
you could have been overbooking
they could have been overbooking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't overbook
you couldn't overbook
she couldn't overbook
we couldn't overbook
you couldn't overbook
they couldn't overbook 	I couldn't be overbooking
you couldn't be overbooking
she couldn't be overbooking
we couldn't be overbooking
you couldn't be overbooking
they couldn't be overbooking	I couldn't have overbooked
you couldn't have overbooked
she couldn't have overbooked
we couldn't have overbooked
you couldn't have overbooked
they couldn't have overbooked	I couldn't have been overbooking
you couldn't have been overbooking
she couldn't have been overbooking
we couldn't have been overbooking
you couldn't have been overbooking
they couldn't have been overbooking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I overbook?
could you overbook?
could she overbook?
could we overbook?
could you overbook?
could they overbook? 	could I be overbooking?
could you be overbooking?
could she be overbooking?
could we be overbooking?
could you be overbooking?
could they be overbooking? 	could I have overbooked?
could you have overbooked?
could she have overbooked?
could we have overbooked?
could you have overbooked?
could they have overbooked? 	could I have been overbooking?
could you have been overbooking?
could she have been overbooking?
could we have been overbooking?
could you have been overbooking?
could they have been overbooking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I overbook?
couldn't you overbook?
couldn't she overbook?
couldn't we overbook?
couldn't you overbook?
couldn't they overbook? 	couldn't I be overbooking?
couldn't you be overbooking?
couldn't she be overbooking?
couldn't we be overbooking?
couldn't you be overbooking?
couldn't they be overbooking? 	couldn't I have overbooked?
couldn't you have overbooked?
couldn't she have overbooked?
couldn't we have overbooked?
couldn't you have overbooked?
couldn't they have overbooked? 	couldn't I have been overbooking?
couldn't you have been overbooking?
couldn't she have been overbooking?
couldn't we have been overbooking?
couldn't you have been overbooking?
couldn't they have been overbooking?