English verb conjugation
COULD DIRTY

Regular verb: dirty - dirtied - dirtied

Affirmation

Simple form	V-ing form
I could dirty you could dirty he could dirty we could dirty you could dirty they could dirty	I could be dirtying you could be dirtying he could be dirtying we could be dirtying you could be dirtying they could be dirtying
Perfect	V-ing perfect
I could have dirtied you could have dirtied he could have dirtied we could have dirtied you could have dirtied they could have dirtied	I could have been dirtying you could have been dirtying he could have been dirtying we could have been dirtying you could have been dirtying they could have been dirtying

Negation

Simple form	V-ing form
I could not dirty you could not dirty he could not dirty we could not dirty you could not dirty they could not dirty	I could not be dirtying you could not be dirtying he could not be dirtying we could not be dirtying you could not be dirtying they could not be dirtying
Perfect	V-ing perfect
I could not have dirtied you could not have dirtied he could not have dirtied we could not have dirtied you could not have dirtied they could not have dirtied	I could not have been dirtying you could not have been dirtying he could not have been dirtying we could not have been dirtying you could not have been dirtying they could not have been dirtying

Interrogative form

Simple form	V-ing form
could I dirty? could you dirty? could he dirty? could we dirty? could you dirty? could they dirty?	could I be dirtying? could you be dirtying? could he be dirtying? could we be dirtying? could you be dirtying? could they be dirtying?
Perfect	V-ing perfect
could I have dirtied? could you have dirtied? could he have dirtied? could we have dirtied? could you have dirtied? could they have dirtied?	could I have been dirtying? could you have been dirtying? could he have been dirtying? could we have been dirtying? could you have been dirtying? could they have been dirtying?

Interro-negative form

Simple form	V-ing form
could I not dirty? could you not dirty? could he not dirty? could we not dirty? could you not dirty? could they not dirty?	could I not be dirtying? could you not be dirtying? could he not be dirtying? could we not be dirtying? could you not be dirtying? could they not be dirtying?
Perfect	V-ing perfect
could I not have dirtied? could you not have dirtied? could he not have dirtied? could we not have dirtied? could you not have dirtied? could they not have dirtied?	could I not have been dirtying? could you not have been dirtying? could he not have been dirtying? could we not have been dirtying? could you not have been dirtying? could they not have been dirtying?