I can plod you can plod he can plod we can plod you can plod they can plod
V-ing form
I can be plodding you can be plodding he can be plodding we can be plodding you can be plodding they can be plodding
Perfect
I can have plodded you can have plodded he can have plodded we can have plodded you can have plodded they can have plodded
V-ing perfect
I can have been plodding you can have been plodding he can have been plodding we can have been plodding you can have been plodding they can have been plodding
Negation
Simple form
I cannot plod you cannot plod he cannot plod we cannot plod you cannot plod they cannot plod
V-ing form
I cannot be plodding you cannot be plodding he cannot be plodding we cannot be plodding you cannot be plodding they cannot be plodding
Perfect
I cannot have plodded you cannot have plodded he cannot have plodded we cannot have plodded you cannot have plodded they cannot have plodded
V-ing perfect
I cannot have been plodding you cannot have been plodding he cannot have been plodding we cannot have been plodding you cannot have been plodding they cannot have been plodding
Interrogative form
Simple form
can I plod? can you plod? can he plod? can we plod? can you plod? can they plod?
V-ing form
can I be plodding? can you be plodding? can he be plodding? can we be plodding? can you be plodding? can they be plodding?
Perfect
can I have plodded? can you have plodded? can he have plodded? can we have plodded? can you have plodded? can they have plodded?
V-ing perfect
can I have been plodding? can you have been plodding? can he have been plodding? can we have been plodding? can you have been plodding? can they have been plodding?
Interro-negative form
Simple form
can I not plod? can you not plod? can he not plod? can we not plod? can you not plod? can they not plod?
V-ing form
can I not be plodding? can you not be plodding? can he not be plodding? can we not be plodding? can you not be plodding? can they not be plodding?
Perfect
can I not have plodded? can you not have plodded? can he not have plodded? can we not have plodded? can you not have plodded? can they not have plodded?
V-ing perfect
can I not have been plodding? can you not have been plodding? can he not have been plodding? can we not have been plodding? can you not have been plodding? can they not have been plodding?