English verb conjugation
COULD SHRIEK

Regular verb: shriek - shrieked - shrieked

Affirmation

Simple form	V-ing form
I could shriek you could shriek he could shriek we could shriek you could shriek they could shriek	I could be shrieking you could be shrieking he 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 he 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 he 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 he 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 he 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 he 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 he 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 he shriek? could we shriek? could you shriek? could they shriek?	could I be shrieking? could you be shrieking? could he 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 he 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 he 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 he 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 he 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 he 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 he have been shrieking? couldn't we have been shrieking? couldn't you have been shrieking? couldn't they have been shrieking?