English verb conjugation COULD SUM

Regular verb: sum - summed - summed

Affirmation

Simple form

I could sum
you could sum
she could sum
we could sum
you could sum
they could sum

V-ing form

I could be summing
you could be summing
she could be summing
we could be summing
you could be summing
they could be summing

Perfect

I could have summed
you could have summed
she could have summed
we could have summed
you could have summed
they could have summed

V-ing perfect

I could have been summing
you could have been summing
she could have been summing
we could have been summing
you could have been summing
they could have been summing

Negation

Simple form

I couldn't sum
you couldn't sum
she couldn't sum
we couldn't sum
you couldn't sum
they couldn't sum

V-ing form

I couldn't be summing
you couldn't be summing
she couldn't be summing
we couldn't be summing
you couldn't be summing
they couldn't be summing

Perfect

I couldn't have summed
you couldn't have summed
she couldn't have summed
we couldn't have summed
you couldn't have summed
they couldn't have summed

V-ing perfect

I couldn't have been summing
you couldn't have been summing
she couldn't have been summing
we couldn't have been summing
you couldn't have been summing
they couldn't have been summing

Interrogative form

Simple form

could I sum?
could you sum?
could she sum?
could we sum?
could you sum?
could they sum?

V-ing form

could I be summing?
could you be summing?
could she be summing?
could we be summing?
could you be summing?
could they be summing?

Perfect

could I have summed?
could you have summed?
could she have summed?
could we have summed?
could you have summed?
could they have summed?

V-ing perfect

could I have been summing?
could you have been summing?
could she have been summing?
could we have been summing?
could you have been summing?
could they have been summing?

Interro-negative form

Simple form

couldn't I sum?
couldn't you sum?
couldn't she sum?
couldn't we sum?
couldn't you sum?
couldn't they sum?

V-ing form

couldn't I be summing?
couldn't you be summing?
couldn't she be summing?
couldn't we be summing?
couldn't you be summing?
couldn't they be summing?

Perfect

couldn't I have summed?
couldn't you have summed?
couldn't she have summed?
couldn't we have summed?
couldn't you have summed?
couldn't they have summed?

V-ing perfect

couldn't I have been summing?
couldn't you have been summing?
couldn't she have been summing?
couldn't we have been summing?
couldn't you have been summing?
couldn't they have been summing?

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