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 can't derail you can't derail he can't derail we can't derail you can't derail they can't derail
V-ing form
I can't be derailing you can't be derailing he can't be derailing we can't be derailing you can't be derailing they can't be derailing
Perfect
I can't have derailed you can't have derailed he can't have derailed we can't have derailed you can't have derailed they can't have derailed
V-ing perfect
I can't have been derailing you can't have been derailing he can't have been derailing we can't have been derailing you can't have been derailing they can't 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't I derail? can't you derail? can't he derail? can't we derail? can't you derail? can't they derail?
V-ing form
can't I be derailing? can't you be derailing? can't he be derailing? can't we be derailing? can't you be derailing? can't they be derailing?
Perfect
can't I have derailed? can't you have derailed? can't he have derailed? can't we have derailed? can't you have derailed? can't they have derailed?
V-ing perfect
can't I have been derailing? can't you have been derailing? can't he have been derailing? can't we have been derailing? can't you have been derailing? can't they have been derailing?