I could structuralize you could structuralize she could structuralize we could structuralize you could structuralize they could structuralize
V-ing form
I could be structuralizing you could be structuralizing she could be structuralizing we could be structuralizing you could be structuralizing they could be structuralizing
Perfect
I could have structuralized you could have structuralized she 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 she 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 she 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 she 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 she 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 she 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 she structuralize? could we structuralize? could you structuralize? could they structuralize?
V-ing form
could I be structuralizing? could you be structuralizing? could she be structuralizing? could we be structuralizing? could you be structuralizing? could they be structuralizing?
Perfect
could I have structuralized? could you have structuralized? could she 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 she 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 she 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 she 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 she 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 she have been structuralizing? couldn't we have been structuralizing? couldn't you have been structuralizing? couldn't they have been structuralizing?