English verb conjugation
COULD SHRIEK

Regular verb: shriek - shrieked - shrieked

Affirmation

Simple form	V-ing form
I could shriek you could shriek she could shriek we could shriek you could shriek they could shriek	I could be shrieking you could be shrieking she could be shrieking we could be shrieking you could be shrieking they could be shrieking
Perfect	V-ing perfect
I could have shrieked you could have shrieked she could have shrieked we could have shrieked you could have shrieked they could have shrieked	I could have been shrieking you could have been shrieking she could have been shrieking we could have been shrieking you could have been shrieking they could have been shrieking

Negation

Simple form	V-ing form
I couldn't shriek you couldn't shriek she couldn't shriek we couldn't shriek you couldn't shriek they couldn't shriek	I couldn't be shrieking you couldn't be shrieking she couldn't be shrieking we couldn't be shrieking you couldn't be shrieking they couldn't be shrieking
Perfect	V-ing perfect
I couldn't have shrieked you couldn't have shrieked she couldn't have shrieked we couldn't have shrieked you couldn't have shrieked they couldn't have shrieked	I couldn't have been shrieking you couldn't have been shrieking she couldn't have been shrieking we couldn't have been shrieking you couldn't have been shrieking they couldn't have been shrieking

Interrogative form

Simple form	V-ing form
could I shriek? could you shriek? could she shriek? could we shriek? could you shriek? could they shriek?	could I be shrieking? could you be shrieking? could she be shrieking? could we be shrieking? could you be shrieking? could they be shrieking?
Perfect	V-ing perfect
could I have shrieked? could you have shrieked? could she have shrieked? could we have shrieked? could you have shrieked? could they have shrieked?	could I have been shrieking? could you have been shrieking? could she have been shrieking? could we have been shrieking? could you have been shrieking? could they have been shrieking?

Interro-negative form

Simple form	V-ing form
couldn't I shriek? couldn't you shriek? couldn't she shriek? couldn't we shriek? couldn't you shriek? couldn't they shriek?	couldn't I be shrieking? couldn't you be shrieking? couldn't she be shrieking? couldn't we be shrieking? couldn't you be shrieking? couldn't they be shrieking?
Perfect	V-ing perfect
couldn't I have shrieked? couldn't you have shrieked? couldn't she have shrieked? couldn't we have shrieked? couldn't you have shrieked? couldn't they have shrieked?	couldn't I have been shrieking? couldn't you have been shrieking? couldn't she have been shrieking? couldn't we have been shrieking? couldn't you have been shrieking? couldn't they have been shrieking?