English verb conjugation MUST TOUGHEN

Regular verb: toughen - toughened - toughened

Affirmation

Simple form

I must toughen
you must toughen
she must toughen
we must toughen
you must toughen
they must toughen

V-ing form

I must be toughening
you must be toughening
she must be toughening
we must be toughening
you must be toughening
they must be toughening

Perfect

I must have toughened
you must have toughened
she 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
she must have been toughening
we must have been toughening
you must have been toughening
they must have been toughening

Negation

Simple form

I mustn't toughen
you mustn't toughen
she mustn't toughen
we mustn't toughen
you mustn't toughen
they mustn't toughen

V-ing form

I mustn't be toughening
you mustn't be toughening
she mustn't be toughening
we mustn't be toughening
you mustn't be toughening
they mustn't be toughening

Perfect

I mustn't have toughened
you mustn't have toughened
she mustn't have toughened
we mustn't have toughened
you mustn't have toughened
they mustn't have toughened

V-ing perfect

I mustn't have been toughening
you mustn't have been toughening
she mustn't have been toughening
we mustn't have been toughening
you mustn't have been toughening
they mustn't have been toughening

Interrogative form

Simple form

must I toughen?
must you toughen?
must she toughen?
must we toughen?
must you toughen?
must they toughen?

V-ing form

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

Perfect

must I have toughened?
must you have toughened?
must she 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 she have been toughening?
must we have been toughening?
must you have been toughening?
must they have been toughening?

Interro-negative form

Simple form

mustn't I toughen?
mustn't you toughen?
mustn't she toughen?
mustn't we toughen?
mustn't you toughen?
mustn't they toughen?

V-ing form

mustn't I be toughening?
mustn't you be toughening?
mustn't she be toughening?
mustn't we be toughening?
mustn't you be toughening?
mustn't they be toughening?

Perfect

mustn't I have toughened?
mustn't you have toughened?
mustn't she have toughened?
mustn't we have toughened?
mustn't you have toughened?
mustn't they have toughened?

V-ing perfect

mustn't I have been toughening?
mustn't you have been toughening?
mustn't she have been toughening?
mustn't we have been toughening?
mustn't you have been toughening?
mustn't they have been toughening?

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