English verb conjugation
COULD PIP

Regular verb: pip - pipped - pipped

Affirmation

Simple form	V-ing form
I could pip you could pip she could pip we could pip you could pip they could pip	I could be pipping you could be pipping she could be pipping we could be pipping you could be pipping they could be pipping
Perfect	V-ing perfect
I could have pipped you could have pipped she could have pipped we could have pipped you could have pipped they could have pipped	I could have been pipping you could have been pipping she could have been pipping we could have been pipping you could have been pipping they could have been pipping

Negation

Simple form	V-ing form
I couldn't pip you couldn't pip she couldn't pip we couldn't pip you couldn't pip they couldn't pip	I couldn't be pipping you couldn't be pipping she couldn't be pipping we couldn't be pipping you couldn't be pipping they couldn't be pipping
Perfect	V-ing perfect
I couldn't have pipped you couldn't have pipped she couldn't have pipped we couldn't have pipped you couldn't have pipped they couldn't have pipped	I couldn't have been pipping you couldn't have been pipping she couldn't have been pipping we couldn't have been pipping you couldn't have been pipping they couldn't have been pipping

Interrogative form

Simple form	V-ing form
could I pip? could you pip? could she pip? could we pip? could you pip? could they pip?	could I be pipping? could you be pipping? could she be pipping? could we be pipping? could you be pipping? could they be pipping?
Perfect	V-ing perfect
could I have pipped? could you have pipped? could she have pipped? could we have pipped? could you have pipped? could they have pipped?	could I have been pipping? could you have been pipping? could she have been pipping? could we have been pipping? could you have been pipping? could they have been pipping?

Interro-negative form

Simple form	V-ing form
couldn't I pip? couldn't you pip? couldn't she pip? couldn't we pip? couldn't you pip? couldn't they pip?	couldn't I be pipping? couldn't you be pipping? couldn't she be pipping? couldn't we be pipping? couldn't you be pipping? couldn't they be pipping?
Perfect	V-ing perfect
couldn't I have pipped? couldn't you have pipped? couldn't she have pipped? couldn't we have pipped? couldn't you have pipped? couldn't they have pipped?	couldn't I have been pipping? couldn't you have been pipping? couldn't she have been pipping? couldn't we have been pipping? couldn't you have been pipping? couldn't they have been pipping?