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