I can cover you can cover she can cover we can cover you can cover they can cover
V-ing form
I can be covering you can be covering she can be covering we can be covering you can be covering they can be covering
Perfect
I can have covered you can have covered she 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 she 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 she 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 she 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 she 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 she 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 she cover? can we cover? can you cover? can they cover?
V-ing form
can I be covering? can you be covering? can she be covering? can we be covering? can you be covering? can they be covering?
Perfect
can I have covered? can you have covered? can she 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 she 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 she 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 she 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 she 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 she have been covering? can't we have been covering? can't you have been covering? can't they have been covering?