English verb conjugation
CAN UNDO

Irregular verb: undo - undid - undone

Affirmation

Simple form	V-ing form
I can undo you can undo she can undo we can undo you can undo they can undo	I can be undoing you can be undoing she can be undoing we can be undoing you can be undoing they can be undoing
Perfect	V-ing perfect
I can have undone you can have undone she can have undone we can have undone you can have undone they can have undone	I can have been undoing you can have been undoing she can have been undoing we can have been undoing you can have been undoing they can have been undoing

Negation

Simple form	V-ing form
I cannot undo you cannot undo she cannot undo we cannot undo you cannot undo they cannot undo	I cannot be undoing you cannot be undoing she cannot be undoing we cannot be undoing you cannot be undoing they cannot be undoing
Perfect	V-ing perfect
I cannot have undone you cannot have undone she cannot have undone we cannot have undone you cannot have undone they cannot have undone	I cannot have been undoing you cannot have been undoing she cannot have been undoing we cannot have been undoing you cannot have been undoing they cannot have been undoing

Interrogative form

Simple form	V-ing form
can I undo? can you undo? can she undo? can we undo? can you undo? can they undo?	can I be undoing? can you be undoing? can she be undoing? can we be undoing? can you be undoing? can they be undoing?
Perfect	V-ing perfect
can I have undone? can you have undone? can she have undone? can we have undone? can you have undone? can they have undone?	can I have been undoing? can you have been undoing? can she have been undoing? can we have been undoing? can you have been undoing? can they have been undoing?

Interro-negative form

Simple form	V-ing form
can I not undo? can you not undo? can she not undo? can we not undo? can you not undo? can they not undo?	can I not be undoing? can you not be undoing? can she not be undoing? can we not be undoing? can you not be undoing? can they not be undoing?
Perfect	V-ing perfect
can I not have undone? can you not have undone? can she not have undone? can we not have undone? can you not have undone? can they not have undone?	can I not have been undoing? can you not have been undoing? can she not have been undoing? can we not have been undoing? can you not have been undoing? can they not have been undoing?