English verb conjugation COULD TOUGHEN

Regular verb: toughen - toughened - toughened

Affirmation

Simple form

I could toughen
you could toughen
he could toughen
we could toughen
you could toughen
they could toughen

V-ing form

I could be toughening
you could be toughening
he could be toughening
we could be toughening
you could be toughening
they could be toughening

Perfect

I could have toughened
you could have toughened
he could have toughened
we could have toughened
you could have toughened
they could have toughened

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I toughen?
could you toughen?
could he toughen?
could we toughen?
could you toughen?
could they toughen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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