could quarrel
Regular verb: quarrel - quarrelled- quarrelled

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