English verb conjugation
COULD SUBJECT

Regular verb: subject - subjected - subjected

Affirmation

Simple form	V-ing form
I could subject you could subject she could subject we could subject you could subject they could subject	I could be subjecting you could be subjecting she could be subjecting we could be subjecting you could be subjecting they could be subjecting
Perfect	V-ing perfect
I could have subjected you could have subjected she could have subjected we could have subjected you could have subjected they could have subjected	I could have been subjecting you could have been subjecting she could have been subjecting we could have been subjecting you could have been subjecting they could have been subjecting

Negation

Simple form	V-ing form
I couldn't subject you couldn't subject she couldn't subject we couldn't subject you couldn't subject they couldn't subject	I couldn't be subjecting you couldn't be subjecting she couldn't be subjecting we couldn't be subjecting you couldn't be subjecting they couldn't be subjecting
Perfect	V-ing perfect
I couldn't have subjected you couldn't have subjected she couldn't have subjected we couldn't have subjected you couldn't have subjected they couldn't have subjected	I couldn't have been subjecting you couldn't have been subjecting she couldn't have been subjecting we couldn't have been subjecting you couldn't have been subjecting they couldn't have been subjecting

Interrogative form

Simple form	V-ing form
could I subject? could you subject? could she subject? could we subject? could you subject? could they subject?	could I be subjecting? could you be subjecting? could she be subjecting? could we be subjecting? could you be subjecting? could they be subjecting?
Perfect	V-ing perfect
could I have subjected? could you have subjected? could she have subjected? could we have subjected? could you have subjected? could they have subjected?	could I have been subjecting? could you have been subjecting? could she have been subjecting? could we have been subjecting? could you have been subjecting? could they have been subjecting?

Interro-negative form

Simple form	V-ing form
couldn't I subject? couldn't you subject? couldn't she subject? couldn't we subject? couldn't you subject? couldn't they subject?	couldn't I be subjecting? couldn't you be subjecting? couldn't she be subjecting? couldn't we be subjecting? couldn't you be subjecting? couldn't they be subjecting?
Perfect	V-ing perfect
couldn't I have subjected? couldn't you have subjected? couldn't she have subjected? couldn't we have subjected? couldn't you have subjected? couldn't they have subjected?	couldn't I have been subjecting? couldn't you have been subjecting? couldn't she have been subjecting? couldn't we have been subjecting? couldn't you have been subjecting? couldn't they have been subjecting?