English verb conjugation CAN TOUGHEN

Regular verb: toughen - toughened - toughened

Affirmation

Simple form

I can toughen
you can toughen
he can toughen
we can toughen
you can toughen
they can toughen

V-ing form

I can be toughening
you can be toughening
he can be toughening
we can be toughening
you can be toughening
they can be toughening

Perfect

I can have toughened
you can have toughened
he can have toughened
we can have toughened
you can have toughened
they can have toughened

V-ing perfect

I can have been toughening
you can have been toughening
he can have been toughening
we can have been toughening
you can have been toughening
they can have been toughening

Negation

Simple form

I can't toughen
you can't toughen
he can't toughen
we can't toughen
you can't toughen
they can't toughen

V-ing form

I can't be toughening
you can't be toughening
he can't be toughening
we can't be toughening
you can't be toughening
they can't be toughening

Perfect

I can't have toughened
you can't have toughened
he can't have toughened
we can't have toughened
you can't have toughened
they can't have toughened

V-ing perfect

I can't have been toughening
you can't have been toughening
he can't have been toughening
we can't have been toughening
you can't have been toughening
they can't have been toughening

Interrogative form

Simple form

can I toughen?
can you toughen?
can he toughen?
can we toughen?
can you toughen?
can they toughen?

V-ing form

can I be toughening?
can you be toughening?
can he be toughening?
can we be toughening?
can you be toughening?
can they be toughening?

Perfect

can I have toughened?
can you have toughened?
can he have toughened?
can we have toughened?
can you have toughened?
can they have toughened?

V-ing perfect

can I have been toughening?
can you have been toughening?
can he have been toughening?
can we have been toughening?
can you have been toughening?
can they have been toughening?

Interro-negative form

Simple form

can't I toughen?
can't you toughen?
can't he toughen?
can't we toughen?
can't you toughen?
can't they toughen?

V-ing form

can't I be toughening?
can't you be toughening?
can't he be toughening?
can't we be toughening?
can't you be toughening?
can't they be toughening?

Perfect

can't I have toughened?
can't you have toughened?
can't he have toughened?
can't we have toughened?
can't you have toughened?
can't they have toughened?

V-ing perfect

can't I have been toughening?
can't you have been toughening?
can't he have been toughening?
can't we have been toughening?
can't you have been toughening?
can't they have been toughening?

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