English verb conjugation
COULD LIP

Regular verb: lip - liped - liped

Affirmation

Simple form	V-ing form
I could lip you could lip he could lip we could lip you could lip they could lip	I could be liping you could be liping he could be liping we could be liping you could be liping they could be liping
Perfect	V-ing perfect
I could have liped you could have liped he could have liped we could have liped you could have liped they could have liped	I could have been liping you could have been liping he could have been liping we could have been liping you could have been liping they could have been liping

Negation

Simple form	V-ing form
I couldn't lip you couldn't lip he couldn't lip we couldn't lip you couldn't lip they couldn't lip	I couldn't be liping you couldn't be liping he couldn't be liping we couldn't be liping you couldn't be liping they couldn't be liping
Perfect	V-ing perfect
I couldn't have liped you couldn't have liped he couldn't have liped we couldn't have liped you couldn't have liped they couldn't have liped	I couldn't have been liping you couldn't have been liping he couldn't have been liping we couldn't have been liping you couldn't have been liping they couldn't have been liping

Interrogative form

Simple form	V-ing form
could I lip? could you lip? could he lip? could we lip? could you lip? could they lip?	could I be liping? could you be liping? could he be liping? could we be liping? could you be liping? could they be liping?
Perfect	V-ing perfect
could I have liped? could you have liped? could he have liped? could we have liped? could you have liped? could they have liped?	could I have been liping? could you have been liping? could he have been liping? could we have been liping? could you have been liping? could they have been liping?

Interro-negative form

Simple form	V-ing form
couldn't I lip? couldn't you lip? couldn't he lip? couldn't we lip? couldn't you lip? couldn't they lip?	couldn't I be liping? couldn't you be liping? couldn't he be liping? couldn't we be liping? couldn't you be liping? couldn't they be liping?
Perfect	V-ing perfect
couldn't I have liped? couldn't you have liped? couldn't he have liped? couldn't we have liped? couldn't you have liped? couldn't they have liped?	couldn't I have been liping? couldn't you have been liping? couldn't he have been liping? couldn't we have been liping? couldn't you have been liping? couldn't they have been liping?