I can derail you can derail he can derail we can derail you can derail they can derail
V-ing form
I can be derailing you can be derailing he can be derailing we can be derailing you can be derailing they can be derailing
Perfect
I can have derailed you can have derailed he can have derailed we can have derailed you can have derailed they can have derailed
V-ing perfect
I can have been derailing you can have been derailing he can have been derailing we can have been derailing you can have been derailing they can have been derailing
Negation
Simple form
I cannot derail you cannot derail he cannot derail we cannot derail you cannot derail they cannot derail
V-ing form
I cannot be derailing you cannot be derailing he cannot be derailing we cannot be derailing you cannot be derailing they cannot be derailing
Perfect
I cannot have derailed you cannot have derailed he cannot have derailed we cannot have derailed you cannot have derailed they cannot have derailed
V-ing perfect
I cannot have been derailing you cannot have been derailing he cannot have been derailing we cannot have been derailing you cannot have been derailing they cannot have been derailing
Interrogative form
Simple form
can I derail? can you derail? can he derail? can we derail? can you derail? can they derail?
V-ing form
can I be derailing? can you be derailing? can he be derailing? can we be derailing? can you be derailing? can they be derailing?
Perfect
can I have derailed? can you have derailed? can he have derailed? can we have derailed? can you have derailed? can they have derailed?
V-ing perfect
can I have been derailing? can you have been derailing? can he have been derailing? can we have been derailing? can you have been derailing? can they have been derailing?
Interro-negative form
Simple form
can I not derail? can you not derail? can he not derail? can we not derail? can you not derail? can they not derail?
V-ing form
can I not be derailing? can you not be derailing? can he not be derailing? can we not be derailing? can you not be derailing? can they not be derailing?
Perfect
can I not have derailed? can you not have derailed? can he not have derailed? can we not have derailed? can you not have derailed? can they not have derailed?
V-ing perfect
can I not have been derailing? can you not have been derailing? can he not have been derailing? can we not have been derailing? can you not have been derailing? can they not have been derailing?