can rat
Regular verb: rat - ratted- ratted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?