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