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 can't stalk you can't stalk he can't stalk we can't stalk you can't stalk they can't stalk
V-ing form
I can't be stalking you can't be stalking he can't be stalking we can't be stalking you can't be stalking they can't be stalking
Perfect
I can't have stalked you can't have stalked he can't have stalked we can't have stalked you can't have stalked they can't have stalked
V-ing perfect
I can't have been stalking you can't have been stalking he can't have been stalking we can't have been stalking you can't have been stalking they can't 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't I stalk? can't you stalk? can't he stalk? can't we stalk? can't you stalk? can't they stalk?
V-ing form
can't I be stalking? can't you be stalking? can't he be stalking? can't we be stalking? can't you be stalking? can't they be stalking?
Perfect
can't I have stalked? can't you have stalked? can't he have stalked? can't we have stalked? can't you have stalked? can't they have stalked?
V-ing perfect
can't I have been stalking? can't you have been stalking? can't he have been stalking? can't we have been stalking? can't you have been stalking? can't they have been stalking?