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