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