English verb conjugation
CAN SUE

Regular verb: sue - sued - sued

Affirmation

Simple form	V-ing form
I can sue you can sue he can sue we can sue you can sue they can sue	I can be suing you can be suing he can be suing we can be suing you can be suing they can be suing
Perfect	V-ing perfect
I can have sued you can have sued he can have sued we can have sued you can have sued they can have sued	I can have been suing you can have been suing he can have been suing we can have been suing you can have been suing they can have been suing

Negation

Simple form	V-ing form
I cannot sue you cannot sue he cannot sue we cannot sue you cannot sue they cannot sue	I cannot be suing you cannot be suing he cannot be suing we cannot be suing you cannot be suing they cannot be suing
Perfect	V-ing perfect
I cannot have sued you cannot have sued he cannot have sued we cannot have sued you cannot have sued they cannot have sued	I cannot have been suing you cannot have been suing he cannot have been suing we cannot have been suing you cannot have been suing they cannot have been suing

Interrogative form

Simple form	V-ing form
can I sue? can you sue? can he sue? can we sue? can you sue? can they sue?	can I be suing? can you be suing? can he be suing? can we be suing? can you be suing? can they be suing?
Perfect	V-ing perfect
can I have sued? can you have sued? can he have sued? can we have sued? can you have sued? can they have sued?	can I have been suing? can you have been suing? can he have been suing? can we have been suing? can you have been suing? can they have been suing?

Interro-negative form

Simple form	V-ing form
can I not sue? can you not sue? can he not sue? can we not sue? can you not sue? can they not sue?	can I not be suing? can you not be suing? can he not be suing? can we not be suing? can you not be suing? can they not be suing?
Perfect	V-ing perfect
can I not have sued? can you not have sued? can he not have sued? can we not have sued? can you not have sued? can they not have sued?	can I not have been suing? can you not have been suing? can he not have been suing? can we not have been suing? can you not have been suing? can they not have been suing?