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