I can prod you can prod he can prod we can prod you can prod they can prod
V-ing form
I can be prodding you can be prodding he can be prodding we can be prodding you can be prodding they can be prodding
Perfect
I can have prodded you can have prodded he can have prodded we can have prodded you can have prodded they can have prodded
V-ing perfect
I can have been prodding you can have been prodding he can have been prodding we can have been prodding you can have been prodding they can have been prodding
Negation
Simple form
I can't prod you can't prod he can't prod we can't prod you can't prod they can't prod
V-ing form
I can't be prodding you can't be prodding he can't be prodding we can't be prodding you can't be prodding they can't be prodding
Perfect
I can't have prodded you can't have prodded he can't have prodded we can't have prodded you can't have prodded they can't have prodded
V-ing perfect
I can't have been prodding you can't have been prodding he can't have been prodding we can't have been prodding you can't have been prodding they can't have been prodding
Interrogative form
Simple form
can I prod? can you prod? can he prod? can we prod? can you prod? can they prod?
V-ing form
can I be prodding? can you be prodding? can he be prodding? can we be prodding? can you be prodding? can they be prodding?
Perfect
can I have prodded? can you have prodded? can he have prodded? can we have prodded? can you have prodded? can they have prodded?
V-ing perfect
can I have been prodding? can you have been prodding? can he have been prodding? can we have been prodding? can you have been prodding? can they have been prodding?
Interro-negative form
Simple form
can't I prod? can't you prod? can't he prod? can't we prod? can't you prod? can't they prod?
V-ing form
can't I be prodding? can't you be prodding? can't he be prodding? can't we be prodding? can't you be prodding? can't they be prodding?
Perfect
can't I have prodded? can't you have prodded? can't he have prodded? can't we have prodded? can't you have prodded? can't they have prodded?
V-ing perfect
can't I have been prodding? can't you have been prodding? can't he have been prodding? can't we have been prodding? can't you have been prodding? can't they have been prodding?