English verb conjugation
COULD TONE

Regular verb: tone - toned - toned

Affirmation

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