English verb conjugation
CAN SKULK

Regular verb: skulk - skulked - skulked

Affirmation

Simple form	V-ing form
I can skulk you can skulk he can skulk we can skulk you can skulk they can skulk	I can be skulking you can be skulking he can be skulking we can be skulking you can be skulking they can be skulking
Perfect	V-ing perfect
I can have skulked you can have skulked he can have skulked we can have skulked you can have skulked they can have skulked	I can have been skulking you can have been skulking he can have been skulking we can have been skulking you can have been skulking they can have been skulking

Negation

Simple form	V-ing form
I can't skulk you can't skulk he can't skulk we can't skulk you can't skulk they can't skulk	I can't be skulking you can't be skulking he can't be skulking we can't be skulking you can't be skulking they can't be skulking
Perfect	V-ing perfect
I can't have skulked you can't have skulked he can't have skulked we can't have skulked you can't have skulked they can't have skulked	I can't have been skulking you can't have been skulking he can't have been skulking we can't have been skulking you can't have been skulking they can't have been skulking

Interrogative form

Simple form	V-ing form
can I skulk? can you skulk? can he skulk? can we skulk? can you skulk? can they skulk?	can I be skulking? can you be skulking? can he be skulking? can we be skulking? can you be skulking? can they be skulking?
Perfect	V-ing perfect
can I have skulked? can you have skulked? can he have skulked? can we have skulked? can you have skulked? can they have skulked?	can I have been skulking? can you have been skulking? can he have been skulking? can we have been skulking? can you have been skulking? can they have been skulking?

Interro-negative form

Simple form	V-ing form
can't I skulk? can't you skulk? can't he skulk? can't we skulk? can't you skulk? can't they skulk?	can't I be skulking? can't you be skulking? can't he be skulking? can't we be skulking? can't you be skulking? can't they be skulking?
Perfect	V-ing perfect
can't I have skulked? can't you have skulked? can't he have skulked? can't we have skulked? can't you have skulked? can't they have skulked?	can't I have been skulking? can't you have been skulking? can't he have been skulking? can't we have been skulking? can't you have been skulking? can't they have been skulking?