I can erect you can erect he can erect we can erect you can erect they can erect
V-ing form
I can be erecting you can be erecting he can be erecting we can be erecting you can be erecting they can be erecting
Perfect
I can have erected you can have erected he can have erected we can have erected you can have erected they can have erected
V-ing perfect
I can have been erecting you can have been erecting he can have been erecting we can have been erecting you can have been erecting they can have been erecting
Negation
Simple form
I can't erect you can't erect he can't erect we can't erect you can't erect they can't erect
V-ing form
I can't be erecting you can't be erecting he can't be erecting we can't be erecting you can't be erecting they can't be erecting
Perfect
I can't have erected you can't have erected he can't have erected we can't have erected you can't have erected they can't have erected
V-ing perfect
I can't have been erecting you can't have been erecting he can't have been erecting we can't have been erecting you can't have been erecting they can't have been erecting
Interrogative form
Simple form
can I erect? can you erect? can he erect? can we erect? can you erect? can they erect?
V-ing form
can I be erecting? can you be erecting? can he be erecting? can we be erecting? can you be erecting? can they be erecting?
Perfect
can I have erected? can you have erected? can he have erected? can we have erected? can you have erected? can they have erected?
V-ing perfect
can I have been erecting? can you have been erecting? can he have been erecting? can we have been erecting? can you have been erecting? can they have been erecting?
Interro-negative form
Simple form
can't I erect? can't you erect? can't he erect? can't we erect? can't you erect? can't they erect?
V-ing form
can't I be erecting? can't you be erecting? can't he be erecting? can't we be erecting? can't you be erecting? can't they be erecting?
Perfect
can't I have erected? can't you have erected? can't he have erected? can't we have erected? can't you have erected? can't they have erected?
V-ing perfect
can't I have been erecting? can't you have been erecting? can't he have been erecting? can't we have been erecting? can't you have been erecting? can't they have been erecting?