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 could not frill you could not frill he could not frill we could not frill you could not frill they could not frill	I could not be frilling you could not be frilling he could not be frilling we could not be frilling you could not be frilling they could not be frilling
Perfect	V-ing perfect
I could not have frilled you could not have frilled he could not have frilled we could not have frilled you could not have frilled they could not have frilled	I could not have been frilling you could not have been frilling he could not have been frilling we could not have been frilling you could not have been frilling they could not 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
could I not frill? could you not frill? could he not frill? could we not frill? could you not frill? could they not frill?	could I not be frilling? could you not be frilling? could he not be frilling? could we not be frilling? could you not be frilling? could they not be frilling?
Perfect	V-ing perfect
could I not have frilled? could you not have frilled? could he not have frilled? could we not have frilled? could you not have frilled? could they not have frilled?	could I not have been frilling? could you not have been frilling? could he not have been frilling? could we not have been frilling? could you not have been frilling? could they not have been frilling?