English verb conjugation COULD STEM

Regular verb: stem - stemmed - stemmed

Affirmation

Simple form

I could stem
you could stem
he could stem
we could stem
you could stem
they could stem

V-ing form

I could be stemming
you could be stemming
he could be stemming
we could be stemming
you could be stemming
they could be stemming

Perfect

I could have stemmed
you could have stemmed
he could have stemmed
we could have stemmed
you could have stemmed
they could have stemmed

V-ing perfect

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

Negation

Simple form

I could not stem
you could not stem
he could not stem
we could not stem
you could not stem
they could not stem

V-ing form

I could not be stemming
you could not be stemming
he could not be stemming
we could not be stemming
you could not be stemming
they could not be stemming

Perfect

I could not have stemmed
you could not have stemmed
he could not have stemmed
we could not have stemmed
you could not have stemmed
they could not have stemmed

V-ing perfect

I could not have been stemming
you could not have been stemming
he could not have been stemming
we could not have been stemming
you could not have been stemming
they could not have been stemming

Interrogative form

Simple form

could I stem?
could you stem?
could he stem?
could we stem?
could you stem?
could they stem?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

could I not stem?
could you not stem?
could he not stem?
could we not stem?
could you not stem?
could they not stem?

V-ing form

could I not be stemming?
could you not be stemming?
could he not be stemming?
could we not be stemming?
could you not be stemming?
could they not be stemming?

Perfect

could I not have stemmed?
could you not have stemmed?
could he not have stemmed?
could we not have stemmed?
could you not have stemmed?
could they not have stemmed?

V-ing perfect

could I not have been stemming?
could you not have been stemming?
could he not have been stemming?
could we not have been stemming?
could you not have been stemming?
could they not have been stemming?

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