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 can't nod you can't nod he can't nod we can't nod you can't nod they can't nod	I can't be nodding you can't be nodding he can't be nodding we can't be nodding you can't be nodding they can't be nodding
Perfect	V-ing perfect
I can't have nodded you can't have nodded he can't have nodded we can't have nodded you can't have nodded they can't have nodded	I can't have been nodding you can't have been nodding he can't have been nodding we can't have been nodding you can't have been nodding they can't 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't I nod? can't you nod? can't he nod? can't we nod? can't you nod? can't they nod?	can't I be nodding? can't you be nodding? can't he be nodding? can't we be nodding? can't you be nodding? can't they be nodding?
Perfect	V-ing perfect
can't I have nodded? can't you have nodded? can't he have nodded? can't we have nodded? can't you have nodded? can't they have nodded?	can't I have been nodding? can't you have been nodding? can't he have been nodding? can't we have been nodding? can't you have been nodding? can't they have been nodding?