I could book you could book she could book we could book you could book they could book
Forma con V-ing
I could be booking you could be booking she could be booking we could be booking you could be booking they could be booking
Perfecto
I could have booked you could have booked she could have booked we could have booked you could have booked they could have booked
Perfecto con V-ing
I could have been booking you could have been booking she could have been booking we could have been booking you could have been booking they could have been booking
Negación
Forma simple
I couldn't book you couldn't book she couldn't book we couldn't book you couldn't book they couldn't book
Forma con V-ing
I couldn't be booking you couldn't be booking she couldn't be booking we couldn't be booking you couldn't be booking they couldn't be booking
Perfecto
I couldn't have booked you couldn't have booked she couldn't have booked we couldn't have booked you couldn't have booked they couldn't have booked
Perfecto con V-ing
I couldn't have been booking you couldn't have been booking she couldn't have been booking we couldn't have been booking you couldn't have been booking they couldn't have been booking
Forma interrogativa
Forma simple
could I book? could you book? could she book? could we book? could you book? could they book?
Forma con V-ing
could I be booking? could you be booking? could she be booking? could we be booking? could you be booking? could they be booking?
Perfecto
could I have booked? could you have booked? could she have booked? could we have booked? could you have booked? could they have booked?
Perfecto con V-ing
could I have been booking? could you have been booking? could she have been booking? could we have been booking? could you have been booking? could they have been booking?
Forma interro-negativa
Forma simple
couldn't I book? couldn't you book? couldn't she book? couldn't we book? couldn't you book? couldn't they book?
Forma con V-ing
couldn't I be booking? couldn't you be booking? couldn't she be booking? couldn't we be booking? couldn't you be booking? couldn't they be booking?
Perfecto
couldn't I have booked? couldn't you have booked? couldn't she have booked? couldn't we have booked? couldn't you have booked? couldn't they have booked?
Perfecto con V-ing
couldn't I have been booking? couldn't you have been booking? couldn't she have been booking? couldn't we have been booking? couldn't you have been booking? couldn't they have been booking?