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 couldn't dirty you couldn't dirty he couldn't dirty we couldn't dirty you couldn't dirty they couldn't dirty	I couldn't be dirtying you couldn't be dirtying he couldn't be dirtying we couldn't be dirtying you couldn't be dirtying they couldn't be dirtying
Perfect	V-ing perfect
I couldn't have dirtied you couldn't have dirtied he couldn't have dirtied we couldn't have dirtied you couldn't have dirtied they couldn't have dirtied	I couldn't have been dirtying you couldn't have been dirtying he couldn't have been dirtying we couldn't have been dirtying you couldn't have been dirtying they couldn't 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
couldn't I dirty? couldn't you dirty? couldn't he dirty? couldn't we dirty? couldn't you dirty? couldn't they dirty?	couldn't I be dirtying? couldn't you be dirtying? couldn't he be dirtying? couldn't we be dirtying? couldn't you be dirtying? couldn't they be dirtying?
Perfect	V-ing perfect
couldn't I have dirtied? couldn't you have dirtied? couldn't he have dirtied? couldn't we have dirtied? couldn't you have dirtied? couldn't they have dirtied?	couldn't I have been dirtying? couldn't you have been dirtying? couldn't he have been dirtying? couldn't we have been dirtying? couldn't you have been dirtying? couldn't they have been dirtying?