must backsolve
Verbo regular: backsolve - backsolved- backsolved

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must backsolve
you must backsolve
he must backsolve
we must backsolve
you must backsolve
they must backsolve 	I must be backsolving
you must be backsolving
he must be backsolving
we must be backsolving
you must be backsolving
they must be backsolving	I must have backsolved
you must have backsolved
he must have backsolved
we must have backsolved
you must have backsolved
they must have backsolved	I must have been backsolving
you must have been backsolving
he must have been backsolving
we must have been backsolving
you must have been backsolving
they must have been backsolving	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't backsolve
you mustn't backsolve
he mustn't backsolve
we mustn't backsolve
you mustn't backsolve
they mustn't backsolve 	I mustn't be backsolving
you mustn't be backsolving
he mustn't be backsolving
we mustn't be backsolving
you mustn't be backsolving
they mustn't be backsolving	I mustn't have backsolved
you mustn't have backsolved
he mustn't have backsolved
we mustn't have backsolved
you mustn't have backsolved
they mustn't have backsolved	I mustn't have been backsolving
you mustn't have been backsolving
he mustn't have been backsolving
we mustn't have been backsolving
you mustn't have been backsolving
they mustn't have been backsolving	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I backsolve?
must you backsolve?
must he backsolve?
must we backsolve?
must you backsolve?
must they backsolve? 	must I be backsolving?
must you be backsolving?
must he be backsolving?
must we be backsolving?
must you be backsolving?
must they be backsolving? 	must I have backsolved?
must you have backsolved?
must he have backsolved?
must we have backsolved?
must you have backsolved?
must they have backsolved? 	must I have been backsolving?
must you have been backsolving?
must he have been backsolving?
must we have been backsolving?
must you have been backsolving?
must they have been backsolving? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I backsolve?
mustn't you backsolve?
mustn't he backsolve?
mustn't we backsolve?
mustn't you backsolve?
mustn't they backsolve? 	mustn't I be backsolving?
mustn't you be backsolving?
mustn't he be backsolving?
mustn't we be backsolving?
mustn't you be backsolving?
mustn't they be backsolving? 	mustn't I have backsolved?
mustn't you have backsolved?
mustn't he have backsolved?
mustn't we have backsolved?
mustn't you have backsolved?
mustn't they have backsolved? 	mustn't I have been backsolving?
mustn't you have been backsolving?
mustn't he have been backsolving?
mustn't we have been backsolving?
mustn't you have been backsolving?
mustn't they have been backsolving?