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