could tone
Regular verb: tone - toned- toned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tone
you could tone
he could tone
we could tone
you could tone
they could tone 	I could be toning
you could be toning
he could be toning
we could be toning
you could be toning
they could be toning	I could have toned
you could have toned
he could have toned
we could have toned
you could have toned
they could have toned	I could have been toning
you could have been toning
he could have been toning
we could have been toning
you could have been toning
they could have been toning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tone
you couldn't tone
he couldn't tone
we couldn't tone
you couldn't tone
they couldn't tone 	I couldn't be toning
you couldn't be toning
he couldn't be toning
we couldn't be toning
you couldn't be toning
they couldn't be toning	I couldn't have toned
you couldn't have toned
he couldn't have toned
we couldn't have toned
you couldn't have toned
they couldn't have toned	I couldn't have been toning
you couldn't have been toning
he couldn't have been toning
we couldn't have been toning
you couldn't have been toning
they couldn't have been toning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tone?
could you tone?
could he tone?
could we tone?
could you tone?
could they tone? 	could I be toning?
could you be toning?
could he be toning?
could we be toning?
could you be toning?
could they be toning? 	could I have toned?
could you have toned?
could he have toned?
could we have toned?
could you have toned?
could they have toned? 	could I have been toning?
could you have been toning?
could he have been toning?
could we have been toning?
could you have been toning?
could they have been toning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tone?
couldn't you tone?
couldn't he tone?
couldn't we tone?
couldn't you tone?
couldn't they tone? 	couldn't I be toning?
couldn't you be toning?
couldn't he be toning?
couldn't we be toning?
couldn't you be toning?
couldn't they be toning? 	couldn't I have toned?
couldn't you have toned?
couldn't he have toned?
couldn't we have toned?
couldn't you have toned?
couldn't they have toned? 	couldn't I have been toning?
couldn't you have been toning?
couldn't he have been toning?
couldn't we have been toning?
couldn't you have been toning?
couldn't they have been toning?