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