English verb conjugation
COULD NIELLO

Regular verb: niello - nielloed - nielloed

Affirmation

Simple form	V-ing form
I could niello you could niello he could niello we could niello you could niello they could niello	I could be nielloing you could be nielloing he could be nielloing we could be nielloing you could be nielloing they could be nielloing
Perfect	V-ing perfect
I could have nielloed you could have nielloed he could have nielloed we could have nielloed you could have nielloed they could have nielloed	I could have been nielloing you could have been nielloing he could have been nielloing we could have been nielloing you could have been nielloing they could have been nielloing

Negation

Simple form	V-ing form
I couldn't niello you couldn't niello he couldn't niello we couldn't niello you couldn't niello they couldn't niello	I couldn't be nielloing you couldn't be nielloing he couldn't be nielloing we couldn't be nielloing you couldn't be nielloing they couldn't be nielloing
Perfect	V-ing perfect
I couldn't have nielloed you couldn't have nielloed he couldn't have nielloed we couldn't have nielloed you couldn't have nielloed they couldn't have nielloed	I couldn't have been nielloing you couldn't have been nielloing he couldn't have been nielloing we couldn't have been nielloing you couldn't have been nielloing they couldn't have been nielloing

Interrogative form

Simple form	V-ing form
could I niello? could you niello? could he niello? could we niello? could you niello? could they niello?	could I be nielloing? could you be nielloing? could he be nielloing? could we be nielloing? could you be nielloing? could they be nielloing?
Perfect	V-ing perfect
could I have nielloed? could you have nielloed? could he have nielloed? could we have nielloed? could you have nielloed? could they have nielloed?	could I have been nielloing? could you have been nielloing? could he have been nielloing? could we have been nielloing? could you have been nielloing? could they have been nielloing?

Interro-negative form

Simple form	V-ing form
couldn't I niello? couldn't you niello? couldn't he niello? couldn't we niello? couldn't you niello? couldn't they niello?	couldn't I be nielloing? couldn't you be nielloing? couldn't he be nielloing? couldn't we be nielloing? couldn't you be nielloing? couldn't they be nielloing?
Perfect	V-ing perfect
couldn't I have nielloed? couldn't you have nielloed? couldn't he have nielloed? couldn't we have nielloed? couldn't you have nielloed? couldn't they have nielloed?	couldn't I have been nielloing? couldn't you have been nielloing? couldn't he have been nielloing? couldn't we have been nielloing? couldn't you have been nielloing? couldn't they have been nielloing?