English verb conjugation MUST SUM

Regular verb: sum - summed - summed

Affirmation

Simple form

I must sum
you must sum
he must sum
we must sum
you must sum
they must sum

V-ing form

I must be summing
you must be summing
he must be summing
we must be summing
you must be summing
they must be summing

Perfect

I must have summed
you must have summed
he must have summed
we must have summed
you must have summed
they must have summed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I sum?
must you sum?
must he sum?
must we sum?
must you sum?
must they sum?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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