English verb conjugation
COULD FRILL

Regular verb: frill - frilled - frilled

Affirmation

Simple form	V-ing form
I could frill you could frill he could frill we could frill you could frill they could frill	I could be frilling you could be frilling he could be frilling we could be frilling you could be frilling they could be frilling
Perfect	V-ing perfect
I could have frilled you could have frilled he could have frilled we could have frilled you could have frilled they could have frilled	I could have been frilling you could have been frilling he could have been frilling we could have been frilling you could have been frilling they could have been frilling

Negation

Simple form	V-ing form
I couldn't frill you couldn't frill he couldn't frill we couldn't frill you couldn't frill they couldn't frill	I couldn't be frilling you couldn't be frilling he couldn't be frilling we couldn't be frilling you couldn't be frilling they couldn't be frilling
Perfect	V-ing perfect
I couldn't have frilled you couldn't have frilled he couldn't have frilled we couldn't have frilled you couldn't have frilled they couldn't have frilled	I couldn't have been frilling you couldn't have been frilling he couldn't have been frilling we couldn't have been frilling you couldn't have been frilling they couldn't have been frilling

Interrogative form

Simple form	V-ing form
could I frill? could you frill? could he frill? could we frill? could you frill? could they frill?	could I be frilling? could you be frilling? could he be frilling? could we be frilling? could you be frilling? could they be frilling?
Perfect	V-ing perfect
could I have frilled? could you have frilled? could he have frilled? could we have frilled? could you have frilled? could they have frilled?	could I have been frilling? could you have been frilling? could he have been frilling? could we have been frilling? could you have been frilling? could they have been frilling?

Interro-negative form

Simple form	V-ing form
couldn't I frill? couldn't you frill? couldn't he frill? couldn't we frill? couldn't you frill? couldn't they frill?	couldn't I be frilling? couldn't you be frilling? couldn't he be frilling? couldn't we be frilling? couldn't you be frilling? couldn't they be frilling?
Perfect	V-ing perfect
couldn't I have frilled? couldn't you have frilled? couldn't he have frilled? couldn't we have frilled? couldn't you have frilled? couldn't they have frilled?	couldn't I have been frilling? couldn't you have been frilling? couldn't he have been frilling? couldn't we have been frilling? couldn't you have been frilling? couldn't they have been frilling?