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