English verb conjugation MUST TOUGH

Regular verb: tough - toughed - toughed

Affirmation

Simple form

I must tough
you must tough
he must tough
we must tough
you must tough
they must tough

V-ing form

I must be toughing
you must be toughing
he must be toughing
we must be toughing
you must be toughing
they must be toughing

Perfect

I must have toughed
you must have toughed
he must have toughed
we must have toughed
you must have toughed
they must have toughed

V-ing perfect

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

Negation

Simple form

I mustn't tough
you mustn't tough
he mustn't tough
we mustn't tough
you mustn't tough
they mustn't tough

V-ing form

I mustn't be toughing
you mustn't be toughing
he mustn't be toughing
we mustn't be toughing
you mustn't be toughing
they mustn't be toughing

Perfect

I mustn't have toughed
you mustn't have toughed
he mustn't have toughed
we mustn't have toughed
you mustn't have toughed
they mustn't have toughed

V-ing perfect

I mustn't have been toughing
you mustn't have been toughing
he mustn't have been toughing
we mustn't have been toughing
you mustn't have been toughing
they mustn't have been toughing

Interrogative form

Simple form

must I tough?
must you tough?
must he tough?
must we tough?
must you tough?
must they tough?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

mustn't I tough?
mustn't you tough?
mustn't he tough?
mustn't we tough?
mustn't you tough?
mustn't they tough?

V-ing form

mustn't I be toughing?
mustn't you be toughing?
mustn't he be toughing?
mustn't we be toughing?
mustn't you be toughing?
mustn't they be toughing?

Perfect

mustn't I have toughed?
mustn't you have toughed?
mustn't he have toughed?
mustn't we have toughed?
mustn't you have toughed?
mustn't they have toughed?

V-ing perfect

mustn't I have been toughing?
mustn't you have been toughing?
mustn't he have been toughing?
mustn't we have been toughing?
mustn't you have been toughing?
mustn't they have been toughing?

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