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