Coniugazione del verbo inglese
CAN TOUGHEN

Verbo regolare: toughen - toughened - toughened

Affermazione

Forma semplice	Forma con V-ing
I can toughen you can toughen she can toughen we can toughen you can toughen they can toughen	I can be toughening you can be toughening she can be toughening we can be toughening you can be toughening they can be toughening
Perfetto	Perfetto con V-ing
I can have toughened you can have toughened she can have toughened we can have toughened you can have toughened they can have toughened	I can have been toughening you can have been toughening she can have been toughening we can have been toughening you can have been toughening they can have been toughening

Negazione

Forma semplice	Forma con V-ing
I cannot toughen you cannot toughen she cannot toughen we cannot toughen you cannot toughen they cannot toughen	I cannot be toughening you cannot be toughening she cannot be toughening we cannot be toughening you cannot be toughening they cannot be toughening
Perfetto	Perfetto con V-ing
I cannot have toughened you cannot have toughened she cannot have toughened we cannot have toughened you cannot have toughened they cannot have toughened	I cannot have been toughening you cannot have been toughening she cannot have been toughening we cannot have been toughening you cannot have been toughening they cannot have been toughening

Forma interrogativa

Forma semplice	Forma con V-ing
can I toughen? can you toughen? can she toughen? can we toughen? can you toughen? can they toughen?	can I be toughening? can you be toughening? can she be toughening? can we be toughening? can you be toughening? can they be toughening?
Perfetto	Perfetto con V-ing
can I have toughened? can you have toughened? can she have toughened? can we have toughened? can you have toughened? can they have toughened?	can I have been toughening? can you have been toughening? can she have been toughening? can we have been toughening? can you have been toughening? can they have been toughening?

Forma interro-negativa

Forma semplice	Forma con V-ing
can I not toughen? can you not toughen? can she not toughen? can we not toughen? can you not toughen? can they not toughen?	can I not be toughening? can you not be toughening? can she not be toughening? can we not be toughening? can you not be toughening? can they not be toughening?
Perfetto	Perfetto con V-ing
can I not have toughened? can you not have toughened? can she not have toughened? can we not have toughened? can you not have toughened? can they not have toughened?	can I not have been toughening? can you not have been toughening? can she not have been toughening? can we not have been toughening? can you not have been toughening? can they not have been toughening?