could burp
Regular verb: burp - burped- burped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could burp
you could burp
she could burp
we could burp
you could burp
they could burp 	I could be burping
you could be burping
she could be burping
we could be burping
you could be burping
they could be burping	I could have burped
you could have burped
she could have burped
we could have burped
you could have burped
they could have burped	I could have been burping
you could have been burping
she could have been burping
we could have been burping
you could have been burping
they could have been burping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't burp
you couldn't burp
she couldn't burp
we couldn't burp
you couldn't burp
they couldn't burp 	I couldn't be burping
you couldn't be burping
she couldn't be burping
we couldn't be burping
you couldn't be burping
they couldn't be burping	I couldn't have burped
you couldn't have burped
she couldn't have burped
we couldn't have burped
you couldn't have burped
they couldn't have burped	I couldn't have been burping
you couldn't have been burping
she couldn't have been burping
we couldn't have been burping
you couldn't have been burping
they couldn't have been burping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I burp?
could you burp?
could she burp?
could we burp?
could you burp?
could they burp? 	could I be burping?
could you be burping?
could she be burping?
could we be burping?
could you be burping?
could they be burping? 	could I have burped?
could you have burped?
could she have burped?
could we have burped?
could you have burped?
could they have burped? 	could I have been burping?
could you have been burping?
could she have been burping?
could we have been burping?
could you have been burping?
could they have been burping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I burp?
couldn't you burp?
couldn't she burp?
couldn't we burp?
couldn't you burp?
couldn't they burp? 	couldn't I be burping?
couldn't you be burping?
couldn't she be burping?
couldn't we be burping?
couldn't you be burping?
couldn't they be burping? 	couldn't I have burped?
couldn't you have burped?
couldn't she have burped?
couldn't we have burped?
couldn't you have burped?
couldn't they have burped? 	couldn't I have been burping?
couldn't you have been burping?
couldn't she have been burping?
couldn't we have been burping?
couldn't you have been burping?
couldn't they have been burping?