English verb conjugation
CAN COUGH

Regular verb: cough - coughed - coughed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can I not cough? can you not cough? can she not cough? can we not cough? can you not cough? can they not cough?	can I not be coughing? can you not be coughing? can she not be coughing? can we not be coughing? can you not be coughing? can they not be coughing?
Perfect	V-ing perfect
can I not have coughed? can you not have coughed? can she not have coughed? can we not have coughed? can you not have coughed? can they not have coughed?	can I not have been coughing? can you not have been coughing? can she not have been coughing? can we not have been coughing? can you not have been coughing? can they not have been coughing?