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