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V-ing form
I could be essaying you could be essaying she could be essaying we could be essaying you could be essaying they could be essaying
Perfect
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V-ing perfect
I could have been essaying you could have been essaying she could have been essaying we could have been essaying you could have been essaying they could have been essaying
Negation
Simple form
I couldn't essay you couldn't essay she couldn't essay we couldn't essay you couldn't essay they couldn't essay
V-ing form
I couldn't be essaying you couldn't be essaying she couldn't be essaying we couldn't be essaying you couldn't be essaying they couldn't be essaying
Perfect
I couldn't have essayed you couldn't have essayed she couldn't have essayed we couldn't have essayed you couldn't have essayed they couldn't have essayed
V-ing perfect
I couldn't have been essaying you couldn't have been essaying she couldn't have been essaying we couldn't have been essaying you couldn't have been essaying they couldn't have been essaying
Interrogative form
Simple form
could I essay? could you essay? could she essay? could we essay? could you essay? could they essay?
V-ing form
could I be essaying? could you be essaying? could she be essaying? could we be essaying? could you be essaying? could they be essaying?
Perfect
could I have essayed? could you have essayed? could she have essayed? could we have essayed? could you have essayed? could they have essayed?
V-ing perfect
could I have been essaying? could you have been essaying? could she have been essaying? could we have been essaying? could you have been essaying? could they have been essaying?
Interro-negative form
Simple form
couldn't I essay? couldn't you essay? couldn't she essay? couldn't we essay? couldn't you essay? couldn't they essay?
V-ing form
couldn't I be essaying? couldn't you be essaying? couldn't she be essaying? couldn't we be essaying? couldn't you be essaying? couldn't they be essaying?
Perfect
couldn't I have essayed? couldn't you have essayed? couldn't she have essayed? couldn't we have essayed? couldn't you have essayed? couldn't they have essayed?
V-ing perfect
couldn't I have been essaying? couldn't you have been essaying? couldn't she have been essaying? couldn't we have been essaying? couldn't you have been essaying? couldn't they have been essaying?