English verb conjugation
COULD RIVET

Regular verb: rivet - riveted - riveted

Affirmation

Simple form	V-ing form
I could rivet you could rivet she could rivet we could rivet you could rivet they could rivet	I could be riveting you could be riveting she could be riveting we could be riveting you could be riveting they could be riveting
Perfect	V-ing perfect
I could have riveted you could have riveted she could have riveted we could have riveted you could have riveted they could have riveted	I could have been riveting you could have been riveting she could have been riveting we could have been riveting you could have been riveting they could have been riveting

Negation

Simple form	V-ing form
I couldn't rivet you couldn't rivet she couldn't rivet we couldn't rivet you couldn't rivet they couldn't rivet	I couldn't be riveting you couldn't be riveting she couldn't be riveting we couldn't be riveting you couldn't be riveting they couldn't be riveting
Perfect	V-ing perfect
I couldn't have riveted you couldn't have riveted she couldn't have riveted we couldn't have riveted you couldn't have riveted they couldn't have riveted	I couldn't have been riveting you couldn't have been riveting she couldn't have been riveting we couldn't have been riveting you couldn't have been riveting they couldn't have been riveting

Interrogative form

Simple form	V-ing form
could I rivet? could you rivet? could she rivet? could we rivet? could you rivet? could they rivet?	could I be riveting? could you be riveting? could she be riveting? could we be riveting? could you be riveting? could they be riveting?
Perfect	V-ing perfect
could I have riveted? could you have riveted? could she have riveted? could we have riveted? could you have riveted? could they have riveted?	could I have been riveting? could you have been riveting? could she have been riveting? could we have been riveting? could you have been riveting? could they have been riveting?

Interro-negative form

Simple form	V-ing form
couldn't I rivet? couldn't you rivet? couldn't she rivet? couldn't we rivet? couldn't you rivet? couldn't they rivet?	couldn't I be riveting? couldn't you be riveting? couldn't she be riveting? couldn't we be riveting? couldn't you be riveting? couldn't they be riveting?
Perfect	V-ing perfect
couldn't I have riveted? couldn't you have riveted? couldn't she have riveted? couldn't we have riveted? couldn't you have riveted? couldn't they have riveted?	couldn't I have been riveting? couldn't you have been riveting? couldn't she have been riveting? couldn't we have been riveting? couldn't you have been riveting? couldn't they have been riveting?