must plank
Verbo regular: plank - planked- planked

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must plank
you must plank
he must plank
we must plank
you must plank
they must plank 	I must be planking
you must be planking
he must be planking
we must be planking
you must be planking
they must be planking	I must have planked
you must have planked
he must have planked
we must have planked
you must have planked
they must have planked	I must have been planking
you must have been planking
he must have been planking
we must have been planking
you must have been planking
they must have been planking	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not plank
you must not plank
he must not plank
we must not plank
you must not plank
they must not plank 	I must not be planking
you must not be planking
he must not be planking
we must not be planking
you must not be planking
they must not be planking	I must not have planked
you must not have planked
he must not have planked
we must not have planked
you must not have planked
they must not have planked	I must not have been planking
you must not have been planking
he must not have been planking
we must not have been planking
you must not have been planking
they must not have been planking	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I plank?
must you plank?
must he plank?
must we plank?
must you plank?
must they plank? 	must I be planking?
must you be planking?
must he be planking?
must we be planking?
must you be planking?
must they be planking? 	must I have planked?
must you have planked?
must he have planked?
must we have planked?
must you have planked?
must they have planked? 	must I have been planking?
must you have been planking?
must he have been planking?
must we have been planking?
must you have been planking?
must they have been planking? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not plank?
must you not plank?
must he not plank?
must we not plank?
must you not plank?
must they not plank? 	must I not be planking?
must you not be planking?
must he not be planking?
must we not be planking?
must you not be planking?
must they not be planking? 	must I not have planked?
must you not have planked?
must he not have planked?
must we not have planked?
must you not have planked?
must they not have planked? 	must I not have been planking?
must you not have been planking?
must he not have been planking?
must we not have been planking?
must you not have been planking?
must they not have been planking?