may cough
Regular verb: cough - coughed- coughed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may cough
you may cough
he may cough
we may cough
you may cough
they may cough 	I may be coughing
you may be coughing
he may be coughing
we may be coughing
you may be coughing
they may be coughing	I may have coughed
you may have coughed
he may have coughed
we may have coughed
you may have coughed
they may have coughed	I may have been coughing
you may have been coughing
he may have been coughing
we may have been coughing
you may have been coughing
they may have been coughing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I may not cough
you may not cough
he may not cough
we may not cough
you may not cough
they may not cough 	I may not be coughing
you may not be coughing
he may not be coughing
we may not be coughing
you may not be coughing
they may not be coughing	I may not have coughed
you may not have coughed
he may not have coughed
we may not have coughed
you may not have coughed
they may not have coughed	I may not have been coughing
you may not have been coughing
he may not have been coughing
we may not have been coughing
you may not have been coughing
they may not have been coughing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I cough?
may you cough?
may he cough?
may we cough?
may you cough?
may they cough? 	may I be coughing?
may you be coughing?
may he be coughing?
may we be coughing?
may you be coughing?
may they be coughing? 	may I have coughed?
may you have coughed?
may he have coughed?
may we have coughed?
may you have coughed?
may they have coughed? 	may I have been coughing?
may you have been coughing?
may he have been coughing?
may we have been coughing?
may you have been coughing?
may they have been coughing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
may I not cough?
may you not cough?
may he not cough?
may we not cough?
may you not cough?
may they not cough? 	may I not be coughing?
may you not be coughing?
may he not be coughing?
may we not be coughing?
may you not be coughing?
may they not be coughing? 	may I not have coughed?
may you not have coughed?
may he not have coughed?
may we not have coughed?
may you not have coughed?
may they not have coughed? 	may I not have been coughing?
may you not have been coughing?
may he not have been coughing?
may we not have been coughing?
may you not have been coughing?
may they not have been coughing?