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