English verb conjugation CAN STACK

Regular verb: stack - stacked - stacked

Affirmation

Simple form

I can stack
you can stack
she can stack
we can stack
you can stack
they can stack

V-ing form

I can be stacking
you can be stacking
she can be stacking
we can be stacking
you can be stacking
they can be stacking

Perfect

I can have stacked
you can have stacked
she can have stacked
we can have stacked
you can have stacked
they can have stacked

V-ing perfect

I can have been stacking
you can have been stacking
she can have been stacking
we can have been stacking
you can have been stacking
they can have been stacking

Negation

Simple form

I cannot stack
you cannot stack
she cannot stack
we cannot stack
you cannot stack
they cannot stack

V-ing form

I cannot be stacking
you cannot be stacking
she cannot be stacking
we cannot be stacking
you cannot be stacking
they cannot be stacking

Perfect

I cannot have stacked
you cannot have stacked
she cannot have stacked
we cannot have stacked
you cannot have stacked
they cannot have stacked

V-ing perfect

I cannot have been stacking
you cannot have been stacking
she cannot have been stacking
we cannot have been stacking
you cannot have been stacking
they cannot have been stacking

Interrogative form

Simple form

can I stack?
can you stack?
can she stack?
can we stack?
can you stack?
can they stack?

V-ing form

can I be stacking?
can you be stacking?
can she be stacking?
can we be stacking?
can you be stacking?
can they be stacking?

Perfect

can I have stacked?
can you have stacked?
can she have stacked?
can we have stacked?
can you have stacked?
can they have stacked?

V-ing perfect

can I have been stacking?
can you have been stacking?
can she have been stacking?
can we have been stacking?
can you have been stacking?
can they have been stacking?

Interro-negative form

Simple form

can I not stack?
can you not stack?
can she not stack?
can we not stack?
can you not stack?
can they not stack?

V-ing form

can I not be stacking?
can you not be stacking?
can she not be stacking?
can we not be stacking?
can you not be stacking?
can they not be stacking?

Perfect

can I not have stacked?
can you not have stacked?
can she not have stacked?
can we not have stacked?
can you not have stacked?
can they not have stacked?

V-ing perfect

can I not have been stacking?
can you not have been stacking?
can she not have been stacking?
can we not have been stacking?
can you not have been stacking?
can they not have been stacking?

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