I could tattoo you could tattoo he could tattoo we could tattoo you could tattoo they could tattoo
V-ing form
I could be tattooing you could be tattooing he could be tattooing we could be tattooing you could be tattooing they could be tattooing
Perfect
I could have tattooed you could have tattooed he could have tattooed we could have tattooed you could have tattooed they could have tattooed
V-ing perfect
I could have been tattooing you could have been tattooing he could have been tattooing we could have been tattooing you could have been tattooing they could have been tattooing
Negation
Simple form
I could not tattoo you could not tattoo he could not tattoo we could not tattoo you could not tattoo they could not tattoo
V-ing form
I could not be tattooing you could not be tattooing he could not be tattooing we could not be tattooing you could not be tattooing they could not be tattooing
Perfect
I could not have tattooed you could not have tattooed he could not have tattooed we could not have tattooed you could not have tattooed they could not have tattooed
V-ing perfect
I could not have been tattooing you could not have been tattooing he could not have been tattooing we could not have been tattooing you could not have been tattooing they could not have been tattooing
Interrogative form
Simple form
could I tattoo? could you tattoo? could he tattoo? could we tattoo? could you tattoo? could they tattoo?
V-ing form
could I be tattooing? could you be tattooing? could he be tattooing? could we be tattooing? could you be tattooing? could they be tattooing?
Perfect
could I have tattooed? could you have tattooed? could he have tattooed? could we have tattooed? could you have tattooed? could they have tattooed?
V-ing perfect
could I have been tattooing? could you have been tattooing? could he have been tattooing? could we have been tattooing? could you have been tattooing? could they have been tattooing?
Interro-negative form
Simple form
could I not tattoo? could you not tattoo? could he not tattoo? could we not tattoo? could you not tattoo? could they not tattoo?
V-ing form
could I not be tattooing? could you not be tattooing? could he not be tattooing? could we not be tattooing? could you not be tattooing? could they not be tattooing?
Perfect
could I not have tattooed? could you not have tattooed? could he not have tattooed? could we not have tattooed? could you not have tattooed? could they not have tattooed?
V-ing perfect
could I not have been tattooing? could you not have been tattooing? could he not have been tattooing? could we not have been tattooing? could you not have been tattooing? could they not have been tattooing?