I can diagram you can diagram he can diagram we can diagram you can diagram they can diagram
V-ing form
I can be diagraming you can be diagraming he can be diagraming we can be diagraming you can be diagraming they can be diagraming
Perfect
I can have diagramed you can have diagramed he can have diagramed we can have diagramed you can have diagramed they can have diagramed
V-ing perfect
I can have been diagraming you can have been diagraming he can have been diagraming we can have been diagraming you can have been diagraming they can have been diagraming
Negation
Simple form
I can't diagram you can't diagram he can't diagram we can't diagram you can't diagram they can't diagram
V-ing form
I can't be diagraming you can't be diagraming he can't be diagraming we can't be diagraming you can't be diagraming they can't be diagraming
Perfect
I can't have diagramed you can't have diagramed he can't have diagramed we can't have diagramed you can't have diagramed they can't have diagramed
V-ing perfect
I can't have been diagraming you can't have been diagraming he can't have been diagraming we can't have been diagraming you can't have been diagraming they can't have been diagraming
Interrogative form
Simple form
can I diagram? can you diagram? can he diagram? can we diagram? can you diagram? can they diagram?
V-ing form
can I be diagraming? can you be diagraming? can he be diagraming? can we be diagraming? can you be diagraming? can they be diagraming?
Perfect
can I have diagramed? can you have diagramed? can he have diagramed? can we have diagramed? can you have diagramed? can they have diagramed?
V-ing perfect
can I have been diagraming? can you have been diagraming? can he have been diagraming? can we have been diagraming? can you have been diagraming? can they have been diagraming?
Interro-negative form
Simple form
can't I diagram? can't you diagram? can't he diagram? can't we diagram? can't you diagram? can't they diagram?
V-ing form
can't I be diagraming? can't you be diagraming? can't he be diagraming? can't we be diagraming? can't you be diagraming? can't they be diagraming?
Perfect
can't I have diagramed? can't you have diagramed? can't he have diagramed? can't we have diagramed? can't you have diagramed? can't they have diagramed?
V-ing perfect
can't I have been diagraming? can't you have been diagraming? can't he have been diagraming? can't we have been diagraming? can't you have been diagraming? can't they have been diagraming?