English verb conjugation
CAN CHANGE

Regular verb: change - changed - changed

Affirmation

Simple form	V-ing form
I can change you can change she can change we can change you can change they can change	I can be changing you can be changing she can be changing we can be changing you can be changing they can be changing
Perfect	V-ing perfect
I can have changed you can have changed she can have changed we can have changed you can have changed they can have changed	I can have been changing you can have been changing she can have been changing we can have been changing you can have been changing they can have been changing

Negation

Simple form	V-ing form
I cannot change you cannot change she cannot change we cannot change you cannot change they cannot change	I cannot be changing you cannot be changing she cannot be changing we cannot be changing you cannot be changing they cannot be changing
Perfect	V-ing perfect
I cannot have changed you cannot have changed she cannot have changed we cannot have changed you cannot have changed they cannot have changed	I cannot have been changing you cannot have been changing she cannot have been changing we cannot have been changing you cannot have been changing they cannot have been changing

Interrogative form

Simple form	V-ing form
can I change? can you change? can she change? can we change? can you change? can they change?	can I be changing? can you be changing? can she be changing? can we be changing? can you be changing? can they be changing?
Perfect	V-ing perfect
can I have changed? can you have changed? can she have changed? can we have changed? can you have changed? can they have changed?	can I have been changing? can you have been changing? can she have been changing? can we have been changing? can you have been changing? can they have been changing?

Interro-negative form

Simple form	V-ing form
can I not change? can you not change? can she not change? can we not change? can you not change? can they not change?	can I not be changing? can you not be changing? can she not be changing? can we not be changing? can you not be changing? can they not be changing?
Perfect	V-ing perfect
can I not have changed? can you not have changed? can she not have changed? can we not have changed? can you not have changed? can they not have changed?	can I not have been changing? can you not have been changing? can she not have been changing? can we not have been changing? can you not have been changing? can they not have been changing?