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