must pretest
Verbo regular: pretest - pretested- pretested

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must pretest
you must pretest
he must pretest
we must pretest
you must pretest
they must pretest 	I must be pretesting
you must be pretesting
he must be pretesting
we must be pretesting
you must be pretesting
they must be pretesting	I must have pretested
you must have pretested
he must have pretested
we must have pretested
you must have pretested
they must have pretested	I must have been pretesting
you must have been pretesting
he must have been pretesting
we must have been pretesting
you must have been pretesting
they must have been pretesting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't pretest
you mustn't pretest
he mustn't pretest
we mustn't pretest
you mustn't pretest
they mustn't pretest 	I mustn't be pretesting
you mustn't be pretesting
he mustn't be pretesting
we mustn't be pretesting
you mustn't be pretesting
they mustn't be pretesting	I mustn't have pretested
you mustn't have pretested
he mustn't have pretested
we mustn't have pretested
you mustn't have pretested
they mustn't have pretested	I mustn't have been pretesting
you mustn't have been pretesting
he mustn't have been pretesting
we mustn't have been pretesting
you mustn't have been pretesting
they mustn't have been pretesting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I pretest?
must you pretest?
must he pretest?
must we pretest?
must you pretest?
must they pretest? 	must I be pretesting?
must you be pretesting?
must he be pretesting?
must we be pretesting?
must you be pretesting?
must they be pretesting? 	must I have pretested?
must you have pretested?
must he have pretested?
must we have pretested?
must you have pretested?
must they have pretested? 	must I have been pretesting?
must you have been pretesting?
must he have been pretesting?
must we have been pretesting?
must you have been pretesting?
must they have been pretesting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I pretest?
mustn't you pretest?
mustn't he pretest?
mustn't we pretest?
mustn't you pretest?
mustn't they pretest? 	mustn't I be pretesting?
mustn't you be pretesting?
mustn't he be pretesting?
mustn't we be pretesting?
mustn't you be pretesting?
mustn't they be pretesting? 	mustn't I have pretested?
mustn't you have pretested?
mustn't he have pretested?
mustn't we have pretested?
mustn't you have pretested?
mustn't they have pretested? 	mustn't I have been pretesting?
mustn't you have been pretesting?
mustn't he have been pretesting?
mustn't we have been pretesting?
mustn't you have been pretesting?
mustn't they have been pretesting?