English verb conjugation MUST STEM

Regular verb: stem - stemmed - stemmed

Affirmation

Simple form

I must stem
you must stem
he must stem
we must stem
you must stem
they must stem

V-ing form

I must be stemming
you must be stemming
he must be stemming
we must be stemming
you must be stemming
they must be stemming

Perfect

I must have stemmed
you must have stemmed
he must have stemmed
we must have stemmed
you must have stemmed
they must have stemmed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

must I stem?
must you stem?
must he stem?
must we stem?
must you stem?
must they stem?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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