English verb conjugation
COULD COUGH

Regular verb: cough - coughed - coughed

Affirmation

Simple form	V-ing form
I could cough you could cough she could cough we could cough you could cough they could cough	I could be coughing you could be coughing she could be coughing we could be coughing you could be coughing they could be coughing
Perfect	V-ing perfect
I could have coughed you could have coughed she could have coughed we could have coughed you could have coughed they could have coughed	I could have been coughing you could have been coughing she could have been coughing we could have been coughing you could have been coughing they could have been coughing

Negation

Simple form	V-ing form
I couldn't cough you couldn't cough she couldn't cough we couldn't cough you couldn't cough they couldn't cough	I couldn't be coughing you couldn't be coughing she couldn't be coughing we couldn't be coughing you couldn't be coughing they couldn't be coughing
Perfect	V-ing perfect
I couldn't have coughed you couldn't have coughed she couldn't have coughed we couldn't have coughed you couldn't have coughed they couldn't have coughed	I couldn't have been coughing you couldn't have been coughing she couldn't have been coughing we couldn't have been coughing you couldn't have been coughing they couldn't have been coughing

Interrogative form

Simple form	V-ing form
could I cough? could you cough? could she cough? could we cough? could you cough? could they cough?	could I be coughing? could you be coughing? could she be coughing? could we be coughing? could you be coughing? could they be coughing?
Perfect	V-ing perfect
could I have coughed? could you have coughed? could she have coughed? could we have coughed? could you have coughed? could they have coughed?	could I have been coughing? could you have been coughing? could she have been coughing? could we have been coughing? could you have been coughing? could they have been coughing?

Interro-negative form

Simple form	V-ing form
couldn't I cough? couldn't you cough? couldn't she cough? couldn't we cough? couldn't you cough? couldn't they cough?	couldn't I be coughing? couldn't you be coughing? couldn't she be coughing? couldn't we be coughing? couldn't you be coughing? couldn't they be coughing?
Perfect	V-ing perfect
couldn't I have coughed? couldn't you have coughed? couldn't she have coughed? couldn't we have coughed? couldn't you have coughed? couldn't they have coughed?	couldn't I have been coughing? couldn't you have been coughing? couldn't she have been coughing? couldn't we have been coughing? couldn't you have been coughing? couldn't they have been coughing?