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