must thank
Verbo regular: thank - thanked- thanked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must thank
you must thank
she must thank
we must thank
you must thank
they must thank 	I must be thanking
you must be thanking
she must be thanking
we must be thanking
you must be thanking
they must be thanking	I must have thanked
you must have thanked
she must have thanked
we must have thanked
you must have thanked
they must have thanked	I must have been thanking
you must have been thanking
she must have been thanking
we must have been thanking
you must have been thanking
they must have been thanking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not thank
you must not thank
she must not thank
we must not thank
you must not thank
they must not thank 	I must not be thanking
you must not be thanking
she must not be thanking
we must not be thanking
you must not be thanking
they must not be thanking	I must not have thanked
you must not have thanked
she must not have thanked
we must not have thanked
you must not have thanked
they must not have thanked	I must not have been thanking
you must not have been thanking
she must not have been thanking
we must not have been thanking
you must not have been thanking
they must not have been thanking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I thank?
must you thank?
must she thank?
must we thank?
must you thank?
must they thank? 	must I be thanking?
must you be thanking?
must she be thanking?
must we be thanking?
must you be thanking?
must they be thanking? 	must I have thanked?
must you have thanked?
must she have thanked?
must we have thanked?
must you have thanked?
must they have thanked? 	must I have been thanking?
must you have been thanking?
must she have been thanking?
must we have been thanking?
must you have been thanking?
must they have been thanking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not thank?
must you not thank?
must she not thank?
must we not thank?
must you not thank?
must they not thank? 	must I not be thanking?
must you not be thanking?
must she not be thanking?
must we not be thanking?
must you not be thanking?
must they not be thanking? 	must I not have thanked?
must you not have thanked?
must she not have thanked?
must we not have thanked?
must you not have thanked?
must they not have thanked? 	must I not have been thanking?
must you not have been thanking?
must she not have been thanking?
must we not have been thanking?
must you not have been thanking?
must they not have been thanking?