I can unite you can unite she can unite we can unite you can unite they can unite
V-ing form
I can be uniting you can be uniting she can be uniting we can be uniting you can be uniting they can be uniting
Perfect
I can have united you can have united she can have united we can have united you can have united they can have united
V-ing perfect
I can have been uniting you can have been uniting she can have been uniting we can have been uniting you can have been uniting they can have been uniting
Negation
Simple form
I can't unite you can't unite she can't unite we can't unite you can't unite they can't unite
V-ing form
I can't be uniting you can't be uniting she can't be uniting we can't be uniting you can't be uniting they can't be uniting
Perfect
I can't have united you can't have united she can't have united we can't have united you can't have united they can't have united
V-ing perfect
I can't have been uniting you can't have been uniting she can't have been uniting we can't have been uniting you can't have been uniting they can't have been uniting
Interrogative form
Simple form
can I unite? can you unite? can she unite? can we unite? can you unite? can they unite?
V-ing form
can I be uniting? can you be uniting? can she be uniting? can we be uniting? can you be uniting? can they be uniting?
Perfect
can I have united? can you have united? can she have united? can we have united? can you have united? can they have united?
V-ing perfect
can I have been uniting? can you have been uniting? can she have been uniting? can we have been uniting? can you have been uniting? can they have been uniting?
Interro-negative form
Simple form
can't I unite? can't you unite? can't she unite? can't we unite? can't you unite? can't they unite?
V-ing form
can't I be uniting? can't you be uniting? can't she be uniting? can't we be uniting? can't you be uniting? can't they be uniting?
Perfect
can't I have united? can't you have united? can't she have united? can't we have united? can't you have united? can't they have united?
V-ing perfect
can't I have been uniting? can't you have been uniting? can't she have been uniting? can't we have been uniting? can't you have been uniting? can't they have been uniting?