English verb conjugation
CAN CHANGE

Regular verb: change - changed - changed

Affirmation

Simple form	V-ing form
I can change you can change he can change we can change you can change they can change	I can be changing you can be changing he 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 he 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 he 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 can't change you can't change he can't change we can't change you can't change they can't change	I can't be changing you can't be changing he can't be changing we can't be changing you can't be changing they can't be changing
Perfect	V-ing perfect
I can't have changed you can't have changed he can't have changed we can't have changed you can't have changed they can't have changed	I can't have been changing you can't have been changing he can't have been changing we can't have been changing you can't have been changing they can't have been changing

Interrogative form

Simple form	V-ing form
can I change? can you change? can he change? can we change? can you change? can they change?	can I be changing? can you be changing? can he 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 he 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 he 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't I change? can't you change? can't he change? can't we change? can't you change? can't they change?	can't I be changing? can't you be changing? can't he be changing? can't we be changing? can't you be changing? can't they be changing?
Perfect	V-ing perfect
can't I have changed? can't you have changed? can't he have changed? can't we have changed? can't you have changed? can't they have changed?	can't I have been changing? can't you have been changing? can't he have been changing? can't we have been changing? can't you have been changing? can't they have been changing?