English verb conjugation MUST TOUGHEN

Regular verb: toughen - toughened - toughened

Affirmation

Simple form

I must toughen
you must toughen
he must toughen
we must toughen
you must toughen
they must toughen

V-ing form

I must be toughening
you must be toughening
he must be toughening
we must be toughening
you must be toughening
they must be toughening

Perfect

I must have toughened
you must have toughened
he must have toughened
we must have toughened
you must have toughened
they must have toughened

V-ing perfect

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

Negation

Simple form

I must not toughen
you must not toughen
he must not toughen
we must not toughen
you must not toughen
they must not toughen

V-ing form

I must not be toughening
you must not be toughening
he must not be toughening
we must not be toughening
you must not be toughening
they must not be toughening

Perfect

I must not have toughened
you must not have toughened
he must not have toughened
we must not have toughened
you must not have toughened
they must not have toughened

V-ing perfect

I must not have been toughening
you must not have been toughening
he must not have been toughening
we must not have been toughening
you must not have been toughening
they must not have been toughening

Interrogative form

Simple form

must I toughen?
must you toughen?
must he toughen?
must we toughen?
must you toughen?
must they toughen?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

must I not toughen?
must you not toughen?
must he not toughen?
must we not toughen?
must you not toughen?
must they not toughen?

V-ing form

must I not be toughening?
must you not be toughening?
must he not be toughening?
must we not be toughening?
must you not be toughening?
must they not be toughening?

Perfect

must I not have toughened?
must you not have toughened?
must he not have toughened?
must we not have toughened?
must you not have toughened?
must they not have toughened?

V-ing perfect

must I not have been toughening?
must you not have been toughening?
must he not have been toughening?
must we not have been toughening?
must you not have been toughening?
must they not have been toughening?

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