I can disagree you can disagree he can disagree we can disagree you can disagree they can disagree
V-ing form
I can be disagreeing you can be disagreeing he can be disagreeing we can be disagreeing you can be disagreeing they can be disagreeing
Perfect
I can have disagreed you can have disagreed he can have disagreed we can have disagreed you can have disagreed they can have disagreed
V-ing perfect
I can have been disagreeing you can have been disagreeing he can have been disagreeing we can have been disagreeing you can have been disagreeing they can have been disagreeing
Negation
Simple form
I can't disagree you can't disagree he can't disagree we can't disagree you can't disagree they can't disagree
V-ing form
I can't be disagreeing you can't be disagreeing he can't be disagreeing we can't be disagreeing you can't be disagreeing they can't be disagreeing
Perfect
I can't have disagreed you can't have disagreed he can't have disagreed we can't have disagreed you can't have disagreed they can't have disagreed
V-ing perfect
I can't have been disagreeing you can't have been disagreeing he can't have been disagreeing we can't have been disagreeing you can't have been disagreeing they can't have been disagreeing
Interrogative form
Simple form
can I disagree? can you disagree? can he disagree? can we disagree? can you disagree? can they disagree?
V-ing form
can I be disagreeing? can you be disagreeing? can he be disagreeing? can we be disagreeing? can you be disagreeing? can they be disagreeing?
Perfect
can I have disagreed? can you have disagreed? can he have disagreed? can we have disagreed? can you have disagreed? can they have disagreed?
V-ing perfect
can I have been disagreeing? can you have been disagreeing? can he have been disagreeing? can we have been disagreeing? can you have been disagreeing? can they have been disagreeing?
Interro-negative form
Simple form
can't I disagree? can't you disagree? can't he disagree? can't we disagree? can't you disagree? can't they disagree?
V-ing form
can't I be disagreeing? can't you be disagreeing? can't he be disagreeing? can't we be disagreeing? can't you be disagreeing? can't they be disagreeing?
Perfect
can't I have disagreed? can't you have disagreed? can't he have disagreed? can't we have disagreed? can't you have disagreed? can't they have disagreed?
V-ing perfect
can't I have been disagreeing? can't you have been disagreeing? can't he have been disagreeing? can't we have been disagreeing? can't you have been disagreeing? can't they have been disagreeing?