English verb conjugation
COULD QUIBBLE

Regular verb: quibble - quibbled - quibbled

Affirmation

Simple form	V-ing form
I could quibble you could quibble he could quibble we could quibble you could quibble they could quibble	I could be quibbling you could be quibbling he could be quibbling we could be quibbling you could be quibbling they could be quibbling
Perfect	V-ing perfect
I could have quibbled you could have quibbled he could have quibbled we could have quibbled you could have quibbled they could have quibbled	I could have been quibbling you could have been quibbling he could have been quibbling we could have been quibbling you could have been quibbling they could have been quibbling

Negation

Simple form	V-ing form
I couldn't quibble you couldn't quibble he couldn't quibble we couldn't quibble you couldn't quibble they couldn't quibble	I couldn't be quibbling you couldn't be quibbling he couldn't be quibbling we couldn't be quibbling you couldn't be quibbling they couldn't be quibbling
Perfect	V-ing perfect
I couldn't have quibbled you couldn't have quibbled he couldn't have quibbled we couldn't have quibbled you couldn't have quibbled they couldn't have quibbled	I couldn't have been quibbling you couldn't have been quibbling he couldn't have been quibbling we couldn't have been quibbling you couldn't have been quibbling they couldn't have been quibbling

Interrogative form

Simple form	V-ing form
could I quibble? could you quibble? could he quibble? could we quibble? could you quibble? could they quibble?	could I be quibbling? could you be quibbling? could he be quibbling? could we be quibbling? could you be quibbling? could they be quibbling?
Perfect	V-ing perfect
could I have quibbled? could you have quibbled? could he have quibbled? could we have quibbled? could you have quibbled? could they have quibbled?	could I have been quibbling? could you have been quibbling? could he have been quibbling? could we have been quibbling? could you have been quibbling? could they have been quibbling?

Interro-negative form

Simple form	V-ing form
couldn't I quibble? couldn't you quibble? couldn't he quibble? couldn't we quibble? couldn't you quibble? couldn't they quibble?	couldn't I be quibbling? couldn't you be quibbling? couldn't he be quibbling? couldn't we be quibbling? couldn't you be quibbling? couldn't they be quibbling?
Perfect	V-ing perfect
couldn't I have quibbled? couldn't you have quibbled? couldn't he have quibbled? couldn't we have quibbled? couldn't you have quibbled? couldn't they have quibbled?	couldn't I have been quibbling? couldn't you have been quibbling? couldn't he have been quibbling? couldn't we have been quibbling? couldn't you have been quibbling? couldn't they have been quibbling?