English verb conjugation
COULD NEST

Regular verb: nest - nested - nested

Affirmation

Simple form	V-ing form
I could nest you could nest she could nest we could nest you could nest they could nest	I could be nesting you could be nesting she could be nesting we could be nesting you could be nesting they could be nesting
Perfect	V-ing perfect
I could have nested you could have nested she could have nested we could have nested you could have nested they could have nested	I could have been nesting you could have been nesting she could have been nesting we could have been nesting you could have been nesting they could have been nesting

Negation

Simple form	V-ing form
I couldn't nest you couldn't nest she couldn't nest we couldn't nest you couldn't nest they couldn't nest	I couldn't be nesting you couldn't be nesting she couldn't be nesting we couldn't be nesting you couldn't be nesting they couldn't be nesting
Perfect	V-ing perfect
I couldn't have nested you couldn't have nested she couldn't have nested we couldn't have nested you couldn't have nested they couldn't have nested	I couldn't have been nesting you couldn't have been nesting she couldn't have been nesting we couldn't have been nesting you couldn't have been nesting they couldn't have been nesting

Interrogative form

Simple form	V-ing form
could I nest? could you nest? could she nest? could we nest? could you nest? could they nest?	could I be nesting? could you be nesting? could she be nesting? could we be nesting? could you be nesting? could they be nesting?
Perfect	V-ing perfect
could I have nested? could you have nested? could she have nested? could we have nested? could you have nested? could they have nested?	could I have been nesting? could you have been nesting? could she have been nesting? could we have been nesting? could you have been nesting? could they have been nesting?

Interro-negative form

Simple form	V-ing form
couldn't I nest? couldn't you nest? couldn't she nest? couldn't we nest? couldn't you nest? couldn't they nest?	couldn't I be nesting? couldn't you be nesting? couldn't she be nesting? couldn't we be nesting? couldn't you be nesting? couldn't they be nesting?
Perfect	V-ing perfect
couldn't I have nested? couldn't you have nested? couldn't she have nested? couldn't we have nested? couldn't you have nested? couldn't they have nested?	couldn't I have been nesting? couldn't you have been nesting? couldn't she have been nesting? couldn't we have been nesting? couldn't you have been nesting? couldn't they have been nesting?