I can shriek you can shriek he can shriek we can shriek you can shriek they can shriek
V-ing form
I can be shrieking you can be shrieking he can be shrieking we can be shrieking you can be shrieking they can be shrieking
Perfect
I can have shrieked you can have shrieked he can have shrieked we can have shrieked you can have shrieked they can have shrieked
V-ing perfect
I can have been shrieking you can have been shrieking he can have been shrieking we can have been shrieking you can have been shrieking they can have been shrieking
Negation
Simple form
I cannot shriek you cannot shriek he cannot shriek we cannot shriek you cannot shriek they cannot shriek
V-ing form
I cannot be shrieking you cannot be shrieking he cannot be shrieking we cannot be shrieking you cannot be shrieking they cannot be shrieking
Perfect
I cannot have shrieked you cannot have shrieked he cannot have shrieked we cannot have shrieked you cannot have shrieked they cannot have shrieked
V-ing perfect
I cannot have been shrieking you cannot have been shrieking he cannot have been shrieking we cannot have been shrieking you cannot have been shrieking they cannot have been shrieking
Interrogative form
Simple form
can I shriek? can you shriek? can he shriek? can we shriek? can you shriek? can they shriek?
V-ing form
can I be shrieking? can you be shrieking? can he be shrieking? can we be shrieking? can you be shrieking? can they be shrieking?
Perfect
can I have shrieked? can you have shrieked? can he have shrieked? can we have shrieked? can you have shrieked? can they have shrieked?
V-ing perfect
can I have been shrieking? can you have been shrieking? can he have been shrieking? can we have been shrieking? can you have been shrieking? can they have been shrieking?
Interro-negative form
Simple form
can I not shriek? can you not shriek? can he not shriek? can we not shriek? can you not shriek? can they not shriek?
V-ing form
can I not be shrieking? can you not be shrieking? can he not be shrieking? can we not be shrieking? can you not be shrieking? can they not be shrieking?
Perfect
can I not have shrieked? can you not have shrieked? can he not have shrieked? can we not have shrieked? can you not have shrieked? can they not have shrieked?
V-ing perfect
can I not have been shrieking? can you not have been shrieking? can he not have been shrieking? can we not have been shrieking? can you not have been shrieking? can they not have been shrieking?