I can stalk you can stalk he can stalk we can stalk you can stalk they can stalk
V-ing form
I can be stalking you can be stalking he can be stalking we can be stalking you can be stalking they can be stalking
Perfect
I can have stalked you can have stalked he can have stalked we can have stalked you can have stalked they can have stalked
V-ing perfect
I can have been stalking you can have been stalking he can have been stalking we can have been stalking you can have been stalking they can have been stalking
Negation
Simple form
I cannot stalk you cannot stalk he cannot stalk we cannot stalk you cannot stalk they cannot stalk
V-ing form
I cannot be stalking you cannot be stalking he cannot be stalking we cannot be stalking you cannot be stalking they cannot be stalking
Perfect
I cannot have stalked you cannot have stalked he cannot have stalked we cannot have stalked you cannot have stalked they cannot have stalked
V-ing perfect
I cannot have been stalking you cannot have been stalking he cannot have been stalking we cannot have been stalking you cannot have been stalking they cannot have been stalking
Interrogative form
Simple form
can I stalk? can you stalk? can he stalk? can we stalk? can you stalk? can they stalk?
V-ing form
can I be stalking? can you be stalking? can he be stalking? can we be stalking? can you be stalking? can they be stalking?
Perfect
can I have stalked? can you have stalked? can he have stalked? can we have stalked? can you have stalked? can they have stalked?
V-ing perfect
can I have been stalking? can you have been stalking? can he have been stalking? can we have been stalking? can you have been stalking? can they have been stalking?
Interro-negative form
Simple form
can I not stalk? can you not stalk? can he not stalk? can we not stalk? can you not stalk? can they not stalk?
V-ing form
can I not be stalking? can you not be stalking? can he not be stalking? can we not be stalking? can you not be stalking? can they not be stalking?
Perfect
can I not have stalked? can you not have stalked? can he not have stalked? can we not have stalked? can you not have stalked? can they not have stalked?
V-ing perfect
can I not have been stalking? can you not have been stalking? can he not have been stalking? can we not have been stalking? can you not have been stalking? can they not have been stalking?