English verb conjugation
COULD UNDER

Regular verb: under - undered - undered

Affirmation

Simple form	V-ing form
I could under you could under he could under we could under you could under they could under	I could be undering you could be undering he could be undering we could be undering you could be undering they could be undering
Perfect	V-ing perfect
I could have undered you could have undered he could have undered we could have undered you could have undered they could have undered	I could have been undering you could have been undering he could have been undering we could have been undering you could have been undering they could have been undering

Negation

Simple form	V-ing form
I couldn't under you couldn't under he couldn't under we couldn't under you couldn't under they couldn't under	I couldn't be undering you couldn't be undering he couldn't be undering we couldn't be undering you couldn't be undering they couldn't be undering
Perfect	V-ing perfect
I couldn't have undered you couldn't have undered he couldn't have undered we couldn't have undered you couldn't have undered they couldn't have undered	I couldn't have been undering you couldn't have been undering he couldn't have been undering we couldn't have been undering you couldn't have been undering they couldn't have been undering

Interrogative form

Simple form	V-ing form
could I under? could you under? could he under? could we under? could you under? could they under?	could I be undering? could you be undering? could he be undering? could we be undering? could you be undering? could they be undering?
Perfect	V-ing perfect
could I have undered? could you have undered? could he have undered? could we have undered? could you have undered? could they have undered?	could I have been undering? could you have been undering? could he have been undering? could we have been undering? could you have been undering? could they have been undering?

Interro-negative form

Simple form	V-ing form
couldn't I under? couldn't you under? couldn't he under? couldn't we under? couldn't you under? couldn't they under?	couldn't I be undering? couldn't you be undering? couldn't he be undering? couldn't we be undering? couldn't you be undering? couldn't they be undering?
Perfect	V-ing perfect
couldn't I have undered? couldn't you have undered? couldn't he have undered? couldn't we have undered? couldn't you have undered? couldn't they have undered?	couldn't I have been undering? couldn't you have been undering? couldn't he have been undering? couldn't we have been undering? couldn't you have been undering? couldn't they have been undering?