I can assign you can assign she can assign we can assign you can assign they can assign
V-ing form
I can be assigning you can be assigning she can be assigning we can be assigning you can be assigning they can be assigning
Perfect
I can have assigned you can have assigned she can have assigned we can have assigned you can have assigned they can have assigned
V-ing perfect
I can have been assigning you can have been assigning she can have been assigning we can have been assigning you can have been assigning they can have been assigning
Negation
Simple form
I can't assign you can't assign she can't assign we can't assign you can't assign they can't assign
V-ing form
I can't be assigning you can't be assigning she can't be assigning we can't be assigning you can't be assigning they can't be assigning
Perfect
I can't have assigned you can't have assigned she can't have assigned we can't have assigned you can't have assigned they can't have assigned
V-ing perfect
I can't have been assigning you can't have been assigning she can't have been assigning we can't have been assigning you can't have been assigning they can't have been assigning
Interrogative form
Simple form
can I assign? can you assign? can she assign? can we assign? can you assign? can they assign?
V-ing form
can I be assigning? can you be assigning? can she be assigning? can we be assigning? can you be assigning? can they be assigning?
Perfect
can I have assigned? can you have assigned? can she have assigned? can we have assigned? can you have assigned? can they have assigned?
V-ing perfect
can I have been assigning? can you have been assigning? can she have been assigning? can we have been assigning? can you have been assigning? can they have been assigning?
Interro-negative form
Simple form
can't I assign? can't you assign? can't she assign? can't we assign? can't you assign? can't they assign?
V-ing form
can't I be assigning? can't you be assigning? can't she be assigning? can't we be assigning? can't you be assigning? can't they be assigning?
Perfect
can't I have assigned? can't you have assigned? can't she have assigned? can't we have assigned? can't you have assigned? can't they have assigned?
V-ing perfect
can't I have been assigning? can't you have been assigning? can't she have been assigning? can't we have been assigning? can't you have been assigning? can't they have been assigning?