English verb conjugation
CAN RAT

Regular verb: rat - ratted - ratted

Affirmation

Simple form	V-ing form
I can rat you can rat he can rat we can rat you can rat they can rat	I can be ratting you can be ratting he can be ratting we can be ratting you can be ratting they can be ratting
Perfect	V-ing perfect
I can have ratted you can have ratted he can have ratted we can have ratted you can have ratted they can have ratted	I can have been ratting you can have been ratting he can have been ratting we can have been ratting you can have been ratting they can have been ratting

Negation

Simple form	V-ing form
I cannot rat you cannot rat he cannot rat we cannot rat you cannot rat they cannot rat	I cannot be ratting you cannot be ratting he cannot be ratting we cannot be ratting you cannot be ratting they cannot be ratting
Perfect	V-ing perfect
I cannot have ratted you cannot have ratted he cannot have ratted we cannot have ratted you cannot have ratted they cannot have ratted	I cannot have been ratting you cannot have been ratting he cannot have been ratting we cannot have been ratting you cannot have been ratting they cannot have been ratting

Interrogative form

Simple form	V-ing form
can I rat? can you rat? can he rat? can we rat? can you rat? can they rat?	can I be ratting? can you be ratting? can he be ratting? can we be ratting? can you be ratting? can they be ratting?
Perfect	V-ing perfect
can I have ratted? can you have ratted? can he have ratted? can we have ratted? can you have ratted? can they have ratted?	can I have been ratting? can you have been ratting? can he have been ratting? can we have been ratting? can you have been ratting? can they have been ratting?

Interro-negative form

Simple form	V-ing form
can I not rat? can you not rat? can he not rat? can we not rat? can you not rat? can they not rat?	can I not be ratting? can you not be ratting? can he not be ratting? can we not be ratting? can you not be ratting? can they not be ratting?
Perfect	V-ing perfect
can I not have ratted? can you not have ratted? can he not have ratted? can we not have ratted? can you not have ratted? can they not have ratted?	can I not have been ratting? can you not have been ratting? can he not have been ratting? can we not have been ratting? can you not have been ratting? can they not have been ratting?