I can confer you can confer she can confer we can confer you can confer they can confer
V-ing form
I can be conferring you can be conferring she can be conferring we can be conferring you can be conferring they can be conferring
Perfect
I can have conferred you can have conferred she can have conferred we can have conferred you can have conferred they can have conferred
V-ing perfect
I can have been conferring you can have been conferring she can have been conferring we can have been conferring you can have been conferring they can have been conferring
Negation
Simple form
I can't confer you can't confer she can't confer we can't confer you can't confer they can't confer
V-ing form
I can't be conferring you can't be conferring she can't be conferring we can't be conferring you can't be conferring they can't be conferring
Perfect
I can't have conferred you can't have conferred she can't have conferred we can't have conferred you can't have conferred they can't have conferred
V-ing perfect
I can't have been conferring you can't have been conferring she can't have been conferring we can't have been conferring you can't have been conferring they can't have been conferring
Interrogative form
Simple form
can I confer? can you confer? can she confer? can we confer? can you confer? can they confer?
V-ing form
can I be conferring? can you be conferring? can she be conferring? can we be conferring? can you be conferring? can they be conferring?
Perfect
can I have conferred? can you have conferred? can she have conferred? can we have conferred? can you have conferred? can they have conferred?
V-ing perfect
can I have been conferring? can you have been conferring? can she have been conferring? can we have been conferring? can you have been conferring? can they have been conferring?
Interro-negative form
Simple form
can't I confer? can't you confer? can't she confer? can't we confer? can't you confer? can't they confer?
V-ing form
can't I be conferring? can't you be conferring? can't she be conferring? can't we be conferring? can't you be conferring? can't they be conferring?
Perfect
can't I have conferred? can't you have conferred? can't she have conferred? can't we have conferred? can't you have conferred? can't they have conferred?
V-ing perfect
can't I have been conferring? can't you have been conferring? can't she have been conferring? can't we have been conferring? can't you have been conferring? can't they have been conferring?