must birch
Verbo regular: birch - birched- birched

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must birch
you must birch
he must birch
we must birch
you must birch
they must birch 	I must be birching
you must be birching
he must be birching
we must be birching
you must be birching
they must be birching	I must have birched
you must have birched
he must have birched
we must have birched
you must have birched
they must have birched	I must have been birching
you must have been birching
he must have been birching
we must have been birching
you must have been birching
they must have been birching	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not birch
you must not birch
he must not birch
we must not birch
you must not birch
they must not birch 	I must not be birching
you must not be birching
he must not be birching
we must not be birching
you must not be birching
they must not be birching	I must not have birched
you must not have birched
he must not have birched
we must not have birched
you must not have birched
they must not have birched	I must not have been birching
you must not have been birching
he must not have been birching
we must not have been birching
you must not have been birching
they must not have been birching	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I birch?
must you birch?
must he birch?
must we birch?
must you birch?
must they birch? 	must I be birching?
must you be birching?
must he be birching?
must we be birching?
must you be birching?
must they be birching? 	must I have birched?
must you have birched?
must he have birched?
must we have birched?
must you have birched?
must they have birched? 	must I have been birching?
must you have been birching?
must he have been birching?
must we have been birching?
must you have been birching?
must they have been birching? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not birch?
must you not birch?
must he not birch?
must we not birch?
must you not birch?
must they not birch? 	must I not be birching?
must you not be birching?
must he not be birching?
must we not be birching?
must you not be birching?
must they not be birching? 	must I not have birched?
must you not have birched?
must he not have birched?
must we not have birched?
must you not have birched?
must they not have birched? 	must I not have been birching?
must you not have been birching?
must he not have been birching?
must we not have been birching?
must you not have been birching?
must they not have been birching?