may toughen
Verbo regolare: toughen - toughened- toughened

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I may toughen
you may toughen
he may toughen
we may toughen
you may toughen
they may toughen 	I may be toughening
you may be toughening
he may be toughening
we may be toughening
you may be toughening
they may be toughening	I may have toughened
you may have toughened
he may have toughened
we may have toughened
you may have toughened
they may have toughened	I may have been toughening
you may have been toughening
he may have been toughening
we may have been toughening
you may have been toughening
they may have been toughening	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I may not toughen
you may not toughen
he may not toughen
we may not toughen
you may not toughen
they may not toughen 	I may not be toughening
you may not be toughening
he may not be toughening
we may not be toughening
you may not be toughening
they may not be toughening	I may not have toughened
you may not have toughened
he may not have toughened
we may not have toughened
you may not have toughened
they may not have toughened	I may not have been toughening
you may not have been toughening
he may not have been toughening
we may not have been toughening
you may not have been toughening
they may not have been toughening	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
may I toughen?
may you toughen?
may he toughen?
may we toughen?
may you toughen?
may they toughen? 	may I be toughening?
may you be toughening?
may he be toughening?
may we be toughening?
may you be toughening?
may they be toughening? 	may I have toughened?
may you have toughened?
may he have toughened?
may we have toughened?
may you have toughened?
may they have toughened? 	may I have been toughening?
may you have been toughening?
may he have been toughening?
may we have been toughening?
may you have been toughening?
may they have been toughening? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
may I not toughen?
may you not toughen?
may he not toughen?
may we not toughen?
may you not toughen?
may they not toughen? 	may I not be toughening?
may you not be toughening?
may he not be toughening?
may we not be toughening?
may you not be toughening?
may they not be toughening? 	may I not have toughened?
may you not have toughened?
may he not have toughened?
may we not have toughened?
may you not have toughened?
may they not have toughened? 	may I not have been toughening?
may you not have been toughening?
may he not have been toughening?
may we not have been toughening?
may you not have been toughening?
may they not have been toughening?