I could lassoo you could lassoo he could lassoo we could lassoo you could lassoo they could lassoo
V-ing form
I could be lassooing you could be lassooing he could be lassooing we could be lassooing you could be lassooing they could be lassooing
Perfect
I could have lassooed you could have lassooed he could have lassooed we could have lassooed you could have lassooed they could have lassooed
V-ing perfect
I could have been lassooing you could have been lassooing he could have been lassooing we could have been lassooing you could have been lassooing they could have been lassooing
Negation
Simple form
I couldn't lassoo you couldn't lassoo he couldn't lassoo we couldn't lassoo you couldn't lassoo they couldn't lassoo
V-ing form
I couldn't be lassooing you couldn't be lassooing he couldn't be lassooing we couldn't be lassooing you couldn't be lassooing they couldn't be lassooing
Perfect
I couldn't have lassooed you couldn't have lassooed he couldn't have lassooed we couldn't have lassooed you couldn't have lassooed they couldn't have lassooed
V-ing perfect
I couldn't have been lassooing you couldn't have been lassooing he couldn't have been lassooing we couldn't have been lassooing you couldn't have been lassooing they couldn't have been lassooing
Interrogative form
Simple form
could I lassoo? could you lassoo? could he lassoo? could we lassoo? could you lassoo? could they lassoo?
V-ing form
could I be lassooing? could you be lassooing? could he be lassooing? could we be lassooing? could you be lassooing? could they be lassooing?
Perfect
could I have lassooed? could you have lassooed? could he have lassooed? could we have lassooed? could you have lassooed? could they have lassooed?
V-ing perfect
could I have been lassooing? could you have been lassooing? could he have been lassooing? could we have been lassooing? could you have been lassooing? could they have been lassooing?
Interro-negative form
Simple form
couldn't I lassoo? couldn't you lassoo? couldn't he lassoo? couldn't we lassoo? couldn't you lassoo? couldn't they lassoo?
V-ing form
couldn't I be lassooing? couldn't you be lassooing? couldn't he be lassooing? couldn't we be lassooing? couldn't you be lassooing? couldn't they be lassooing?
Perfect
couldn't I have lassooed? couldn't you have lassooed? couldn't he have lassooed? couldn't we have lassooed? couldn't you have lassooed? couldn't they have lassooed?
V-ing perfect
couldn't I have been lassooing? couldn't you have been lassooing? couldn't he have been lassooing? couldn't we have been lassooing? couldn't you have been lassooing? couldn't they have been lassooing?