could vomit
Regular verb: vomit - vomited- vomited

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could vomit
you could vomit
he could vomit
we could vomit
you could vomit
they could vomit 	I could be vomiting
you could be vomiting
he could be vomiting
we could be vomiting
you could be vomiting
they could be vomiting	I could have vomited
you could have vomited
he could have vomited
we could have vomited
you could have vomited
they could have vomited	I could have been vomiting
you could have been vomiting
he could have been vomiting
we could have been vomiting
you could have been vomiting
they could have been vomiting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not vomit
you could not vomit
he could not vomit
we could not vomit
you could not vomit
they could not vomit 	I could not be vomiting
you could not be vomiting
he could not be vomiting
we could not be vomiting
you could not be vomiting
they could not be vomiting	I could not have vomited
you could not have vomited
he could not have vomited
we could not have vomited
you could not have vomited
they could not have vomited	I could not have been vomiting
you could not have been vomiting
he could not have been vomiting
we could not have been vomiting
you could not have been vomiting
they could not have been vomiting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I vomit?
could you vomit?
could he vomit?
could we vomit?
could you vomit?
could they vomit? 	could I be vomiting?
could you be vomiting?
could he be vomiting?
could we be vomiting?
could you be vomiting?
could they be vomiting? 	could I have vomited?
could you have vomited?
could he have vomited?
could we have vomited?
could you have vomited?
could they have vomited? 	could I have been vomiting?
could you have been vomiting?
could he have been vomiting?
could we have been vomiting?
could you have been vomiting?
could they have been vomiting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not vomit?
could you not vomit?
could he not vomit?
could we not vomit?
could you not vomit?
could they not vomit? 	could I not be vomiting?
could you not be vomiting?
could he not be vomiting?
could we not be vomiting?
could you not be vomiting?
could they not be vomiting? 	could I not have vomited?
could you not have vomited?
could he not have vomited?
could we not have vomited?
could you not have vomited?
could they not have vomited? 	could I not have been vomiting?
could you not have been vomiting?
could he not have been vomiting?
could we not have been vomiting?
could you not have been vomiting?
could they not have been vomiting?