English verb conjugation
COULD BURP

Regular verb: burp - burped - burped

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
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
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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
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?
Perfect	V-ing perfect
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?