English verb conjugation
COULD TOOTH

Regular verb: tooth - toothed - toothed

Affirmation

Simple form	V-ing form
I could tooth you could tooth she could tooth we could tooth you could tooth they could tooth	I could be toothing you could be toothing she could be toothing we could be toothing you could be toothing they could be toothing
Perfect	V-ing perfect
I could have toothed you could have toothed she could have toothed we could have toothed you could have toothed they could have toothed	I could have been toothing you could have been toothing she could have been toothing we could have been toothing you could have been toothing they could have been toothing

Negation

Simple form	V-ing form
I couldn't tooth you couldn't tooth she couldn't tooth we couldn't tooth you couldn't tooth they couldn't tooth	I couldn't be toothing you couldn't be toothing she couldn't be toothing we couldn't be toothing you couldn't be toothing they couldn't be toothing
Perfect	V-ing perfect
I couldn't have toothed you couldn't have toothed she couldn't have toothed we couldn't have toothed you couldn't have toothed they couldn't have toothed	I couldn't have been toothing you couldn't have been toothing she couldn't have been toothing we couldn't have been toothing you couldn't have been toothing they couldn't have been toothing

Interrogative form

Simple form	V-ing form
could I tooth? could you tooth? could she tooth? could we tooth? could you tooth? could they tooth?	could I be toothing? could you be toothing? could she be toothing? could we be toothing? could you be toothing? could they be toothing?
Perfect	V-ing perfect
could I have toothed? could you have toothed? could she have toothed? could we have toothed? could you have toothed? could they have toothed?	could I have been toothing? could you have been toothing? could she have been toothing? could we have been toothing? could you have been toothing? could they have been toothing?

Interro-negative form

Simple form	V-ing form
couldn't I tooth? couldn't you tooth? couldn't she tooth? couldn't we tooth? couldn't you tooth? couldn't they tooth?	couldn't I be toothing? couldn't you be toothing? couldn't she be toothing? couldn't we be toothing? couldn't you be toothing? couldn't they be toothing?
Perfect	V-ing perfect
couldn't I have toothed? couldn't you have toothed? couldn't she have toothed? couldn't we have toothed? couldn't you have toothed? couldn't they have toothed?	couldn't I have been toothing? couldn't you have been toothing? couldn't she have been toothing? couldn't we have been toothing? couldn't you have been toothing? couldn't they have been toothing?