English verb conjugation MUST UNDERSTAND

Irregular verb: understand - understood - understood

Affirmation

Simple form

I must understand
you must understand
he must understand
we must understand
you must understand
they must understand

V-ing form

I must be understanding
you must be understanding
he must be understanding
we must be understanding
you must be understanding
they must be understanding

Perfect

I must have understood
you must have understood
he must have understood
we must have understood
you must have understood
they must have understood

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I understand?
must you understand?
must he understand?
must we understand?
must you understand?
must they understand?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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