English verb conjugation CAN SUM

Regular verb: sum - summed - summed

Affirmation

Simple form

I can sum
you can sum
he can sum
we can sum
you can sum
they can sum

V-ing form

I can be summing
you can be summing
he can be summing
we can be summing
you can be summing
they can be summing

Perfect

I can have summed
you can have summed
he can have summed
we can have summed
you can have summed
they can have summed

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I sum?
can you sum?
can he sum?
can we sum?
can you sum?
can they sum?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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