English verb conjugation
CAN NOD

Regular verb: nod - nodded - nodded

Affirmation

Simple form	V-ing form
I can nod you can nod he can nod we can nod you can nod they can nod	I can be nodding you can be nodding he can be nodding we can be nodding you can be nodding they can be nodding
Perfect	V-ing perfect
I can have nodded you can have nodded he can have nodded we can have nodded you can have nodded they can have nodded	I can have been nodding you can have been nodding he can have been nodding we can have been nodding you can have been nodding they can have been nodding

Negation

Simple form	V-ing form
I cannot nod you cannot nod he cannot nod we cannot nod you cannot nod they cannot nod	I cannot be nodding you cannot be nodding he cannot be nodding we cannot be nodding you cannot be nodding they cannot be nodding
Perfect	V-ing perfect
I cannot have nodded you cannot have nodded he cannot have nodded we cannot have nodded you cannot have nodded they cannot have nodded	I cannot have been nodding you cannot have been nodding he cannot have been nodding we cannot have been nodding you cannot have been nodding they cannot have been nodding

Interrogative form

Simple form	V-ing form
can I nod? can you nod? can he nod? can we nod? can you nod? can they nod?	can I be nodding? can you be nodding? can he be nodding? can we be nodding? can you be nodding? can they be nodding?
Perfect	V-ing perfect
can I have nodded? can you have nodded? can he have nodded? can we have nodded? can you have nodded? can they have nodded?	can I have been nodding? can you have been nodding? can he have been nodding? can we have been nodding? can you have been nodding? can they have been nodding?

Interro-negative form

Simple form	V-ing form
can I not nod? can you not nod? can he not nod? can we not nod? can you not nod? can they not nod?	can I not be nodding? can you not be nodding? can he not be nodding? can we not be nodding? can you not be nodding? can they not be nodding?
Perfect	V-ing perfect
can I not have nodded? can you not have nodded? can he not have nodded? can we not have nodded? can you not have nodded? can they not have nodded?	can I not have been nodding? can you not have been nodding? can he not have been nodding? can we not have been nodding? can you not have been nodding? can they not have been nodding?