English verb conjugation
COULD QUARREL

Regular verb: quarrel - quarrelled - quarrelled

Affirmation

Simple form	V-ing form
I could quarrel you could quarrel he could quarrel we could quarrel you could quarrel they could quarrel	I could be quarrelling you could be quarrelling he could be quarrelling we could be quarrelling you could be quarrelling they could be quarrelling
Perfect	V-ing perfect
I could have quarrelled you could have quarrelled he could have quarrelled we could have quarrelled you could have quarrelled they could have quarrelled	I could have been quarrelling you could have been quarrelling he could have been quarrelling we could have been quarrelling you could have been quarrelling they could have been quarrelling

Negation

Simple form	V-ing form
I couldn't quarrel you couldn't quarrel he couldn't quarrel we couldn't quarrel you couldn't quarrel they couldn't quarrel	I couldn't be quarrelling you couldn't be quarrelling he couldn't be quarrelling we couldn't be quarrelling you couldn't be quarrelling they couldn't be quarrelling
Perfect	V-ing perfect
I couldn't have quarrelled you couldn't have quarrelled he couldn't have quarrelled we couldn't have quarrelled you couldn't have quarrelled they couldn't have quarrelled	I couldn't have been quarrelling you couldn't have been quarrelling he couldn't have been quarrelling we couldn't have been quarrelling you couldn't have been quarrelling they couldn't have been quarrelling

Interrogative form

Simple form	V-ing form
could I quarrel? could you quarrel? could he quarrel? could we quarrel? could you quarrel? could they quarrel?	could I be quarrelling? could you be quarrelling? could he be quarrelling? could we be quarrelling? could you be quarrelling? could they be quarrelling?
Perfect	V-ing perfect
could I have quarrelled? could you have quarrelled? could he have quarrelled? could we have quarrelled? could you have quarrelled? could they have quarrelled?	could I have been quarrelling? could you have been quarrelling? could he have been quarrelling? could we have been quarrelling? could you have been quarrelling? could they have been quarrelling?

Interro-negative form

Simple form	V-ing form
couldn't I quarrel? couldn't you quarrel? couldn't he quarrel? couldn't we quarrel? couldn't you quarrel? couldn't they quarrel?	couldn't I be quarrelling? couldn't you be quarrelling? couldn't he be quarrelling? couldn't we be quarrelling? couldn't you be quarrelling? couldn't they be quarrelling?
Perfect	V-ing perfect
couldn't I have quarrelled? couldn't you have quarrelled? couldn't he have quarrelled? couldn't we have quarrelled? couldn't you have quarrelled? couldn't they have quarrelled?	couldn't I have been quarrelling? couldn't you have been quarrelling? couldn't he have been quarrelling? couldn't we have been quarrelling? couldn't you have been quarrelling? couldn't they have been quarrelling?