I could survive you could survive she could survive we could survive you could survive they could survive
V-ing form
I could be surviving you could be surviving she could be surviving we could be surviving you could be surviving they could be surviving
Perfect
I could have survived you could have survived she could have survived we could have survived you could have survived they could have survived
V-ing perfect
I could have been surviving you could have been surviving she could have been surviving we could have been surviving you could have been surviving they could have been surviving
Negation
Simple form
I couldn't survive you couldn't survive she couldn't survive we couldn't survive you couldn't survive they couldn't survive
V-ing form
I couldn't be surviving you couldn't be surviving she couldn't be surviving we couldn't be surviving you couldn't be surviving they couldn't be surviving
Perfect
I couldn't have survived you couldn't have survived she couldn't have survived we couldn't have survived you couldn't have survived they couldn't have survived
V-ing perfect
I couldn't have been surviving you couldn't have been surviving she couldn't have been surviving we couldn't have been surviving you couldn't have been surviving they couldn't have been surviving
Interrogative form
Simple form
could I survive? could you survive? could she survive? could we survive? could you survive? could they survive?
V-ing form
could I be surviving? could you be surviving? could she be surviving? could we be surviving? could you be surviving? could they be surviving?
Perfect
could I have survived? could you have survived? could she have survived? could we have survived? could you have survived? could they have survived?
V-ing perfect
could I have been surviving? could you have been surviving? could she have been surviving? could we have been surviving? could you have been surviving? could they have been surviving?
Interro-negative form
Simple form
couldn't I survive? couldn't you survive? couldn't she survive? couldn't we survive? couldn't you survive? couldn't they survive?
V-ing form
couldn't I be surviving? couldn't you be surviving? couldn't she be surviving? couldn't we be surviving? couldn't you be surviving? couldn't they be surviving?
Perfect
couldn't I have survived? couldn't you have survived? couldn't she have survived? couldn't we have survived? couldn't you have survived? couldn't they have survived?
V-ing perfect
couldn't I have been surviving? couldn't you have been surviving? couldn't she have been surviving? couldn't we have been surviving? couldn't you have been surviving? couldn't they have been surviving?