I can cover you can cover he can cover we can cover you can cover they can cover
V-ing form
I can be covering you can be covering he can be covering we can be covering you can be covering they can be covering
Perfect
I can have covered you can have covered he can have covered we can have covered you can have covered they can have covered
V-ing perfect
I can have been covering you can have been covering he can have been covering we can have been covering you can have been covering they can have been covering
Negation
Simple form
I can't cover you can't cover he can't cover we can't cover you can't cover they can't cover
V-ing form
I can't be covering you can't be covering he can't be covering we can't be covering you can't be covering they can't be covering
Perfect
I can't have covered you can't have covered he can't have covered we can't have covered you can't have covered they can't have covered
V-ing perfect
I can't have been covering you can't have been covering he can't have been covering we can't have been covering you can't have been covering they can't have been covering
Interrogative form
Simple form
can I cover? can you cover? can he cover? can we cover? can you cover? can they cover?
V-ing form
can I be covering? can you be covering? can he be covering? can we be covering? can you be covering? can they be covering?
Perfect
can I have covered? can you have covered? can he have covered? can we have covered? can you have covered? can they have covered?
V-ing perfect
can I have been covering? can you have been covering? can he have been covering? can we have been covering? can you have been covering? can they have been covering?
Interro-negative form
Simple form
can't I cover? can't you cover? can't he cover? can't we cover? can't you cover? can't they cover?
V-ing form
can't I be covering? can't you be covering? can't he be covering? can't we be covering? can't you be covering? can't they be covering?
Perfect
can't I have covered? can't you have covered? can't he have covered? can't we have covered? can't you have covered? can't they have covered?
V-ing perfect
can't I have been covering? can't you have been covering? can't he have been covering? can't we have been covering? can't you have been covering? can't they have been covering?