Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I could execute execute you could execute execute she could execute execute we could execute execute you could execute execute they could execute execute
V-ing form
I could be execute executing you could be execute executing she could be execute executing we could be execute executing you could be execute executing they could be execute executing
Perfect
I could have execute executed you could have execute executed she could have execute executed we could have execute executed you could have execute executed they could have execute executed
V-ing perfect
I could have been execute executing you could have been execute executing she could have been execute executing we could have been execute executing you could have been execute executing they could have been execute executing
Negation
Simple form
I couldn't execute execute you couldn't execute execute she couldn't execute execute we couldn't execute execute you couldn't execute execute they couldn't execute execute
V-ing form
I couldn't be execute executing you couldn't be execute executing she couldn't be execute executing we couldn't be execute executing you couldn't be execute executing they couldn't be execute executing
Perfect
I couldn't have execute executed you couldn't have execute executed she couldn't have execute executed we couldn't have execute executed you couldn't have execute executed they couldn't have execute executed
V-ing perfect
I couldn't have been execute executing you couldn't have been execute executing she couldn't have been execute executing we couldn't have been execute executing you couldn't have been execute executing they couldn't have been execute executing
Interrogative form
Simple form
could I execute execute? could you execute execute? could she execute execute? could we execute execute? could you execute execute? could they execute execute?
V-ing form
could I be execute executing? could you be execute executing? could she be execute executing? could we be execute executing? could you be execute executing? could they be execute executing?
Perfect
could I have execute executed? could you have execute executed? could she have execute executed? could we have execute executed? could you have execute executed? could they have execute executed?
V-ing perfect
could I have been execute executing? could you have been execute executing? could she have been execute executing? could we have been execute executing? could you have been execute executing? could they have been execute executing?
Interro-negative form
Simple form
couldn't I execute execute? couldn't you execute execute? couldn't she execute execute? couldn't we execute execute? couldn't you execute execute? couldn't they execute execute?
V-ing form
couldn't I be execute executing? couldn't you be execute executing? couldn't she be execute executing? couldn't we be execute executing? couldn't you be execute executing? couldn't they be execute executing?
Perfect
couldn't I have execute executed? couldn't you have execute executed? couldn't she have execute executed? couldn't we have execute executed? couldn't you have execute executed? couldn't they have execute executed?
V-ing perfect
couldn't I have been execute executing? couldn't you have been execute executing? couldn't she have been execute executing? couldn't we have been execute executing? couldn't you have been execute executing? couldn't they have been execute executing?