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 could not externalise you could not externalise he could not externalise we could not externalise you could not externalise they could not externalise
V-ing form
I could not be externalising you could not be externalising he could not be externalising we could not be externalising you could not be externalising they could not be externalising
Perfect
I could not have externalised you could not have externalised he could not have externalised we could not have externalised you could not have externalised they could not have externalised
V-ing perfect
I could not have been externalising you could not have been externalising he could not have been externalising we could not have been externalising you could not have been externalising they could not 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
could I not externalise? could you not externalise? could he not externalise? could we not externalise? could you not externalise? could they not externalise?
V-ing form
could I not be externalising? could you not be externalising? could he not be externalising? could we not be externalising? could you not be externalising? could they not be externalising?
Perfect
could I not have externalised? could you not have externalised? could he not have externalised? could we not have externalised? could you not have externalised? could they not have externalised?
V-ing perfect
could I not have been externalising? could you not have been externalising? could he not have been externalising? could we not have been externalising? could you not have been externalising? could they not have been externalising?