English verb conjugation
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Regular verb: book - booked - booked

Affirmation

Simple form	V-ing form
I must book you must book she must book we must book you must book they must book	I must be booking you must be booking she must be booking we must be booking you must be booking they must be booking
Perfect	V-ing perfect
I must have booked you must have booked she must have booked we must have booked you must have booked they must have booked	I must have been booking you must have been booking she must have been booking we must have been booking you must have been booking they must have been booking

Negation

Simple form	V-ing form
I mustn't book you mustn't book she mustn't book we mustn't book you mustn't book they mustn't book	I mustn't be booking you mustn't be booking she mustn't be booking we mustn't be booking you mustn't be booking they mustn't be booking
Perfect	V-ing perfect
I mustn't have booked you mustn't have booked she mustn't have booked we mustn't have booked you mustn't have booked they mustn't have booked	I mustn't have been booking you mustn't have been booking she mustn't have been booking we mustn't have been booking you mustn't have been booking they mustn't have been booking

Interrogative form

Simple form	V-ing form
must I book? must you book? must she book? must we book? must you book? must they book?	must I be booking? must you be booking? must she be booking? must we be booking? must you be booking? must they be booking?
Perfect	V-ing perfect
must I have booked? must you have booked? must she have booked? must we have booked? must you have booked? must they have booked?	must I have been booking? must you have been booking? must she have been booking? must we have been booking? must you have been booking? must they have been booking?

Interro-negative form

Simple form	V-ing form
mustn't I book? mustn't you book? mustn't she book? mustn't we book? mustn't you book? mustn't they book?	mustn't I be booking? mustn't you be booking? mustn't she be booking? mustn't we be booking? mustn't you be booking? mustn't they be booking?
Perfect	V-ing perfect
mustn't I have booked? mustn't you have booked? mustn't she have booked? mustn't we have booked? mustn't you have booked? mustn't they have booked?	mustn't I have been booking? mustn't you have been booking? mustn't she have been booking? mustn't we have been booking? mustn't you have been booking? mustn't they have been booking?