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