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 couldn't tattoo you couldn't tattoo he couldn't tattoo we couldn't tattoo you couldn't tattoo they couldn't tattoo
V-ing form
I couldn't be tattooing you couldn't be tattooing he couldn't be tattooing we couldn't be tattooing you couldn't be tattooing they couldn't be tattooing
Perfect
I couldn't have tattooed you couldn't have tattooed he couldn't have tattooed we couldn't have tattooed you couldn't have tattooed they couldn't have tattooed
V-ing perfect
I couldn't have been tattooing you couldn't have been tattooing he couldn't have been tattooing we couldn't have been tattooing you couldn't have been tattooing they couldn't 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
couldn't I tattoo? couldn't you tattoo? couldn't he tattoo? couldn't we tattoo? couldn't you tattoo? couldn't they tattoo?
V-ing form
couldn't I be tattooing? couldn't you be tattooing? couldn't he be tattooing? couldn't we be tattooing? couldn't you be tattooing? couldn't they be tattooing?
Perfect
couldn't I have tattooed? couldn't you have tattooed? couldn't he have tattooed? couldn't we have tattooed? couldn't you have tattooed? couldn't they have tattooed?
V-ing perfect
couldn't I have been tattooing? couldn't you have been tattooing? couldn't he have been tattooing? couldn't we have been tattooing? couldn't you have been tattooing? couldn't they have been tattooing?