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