can frog
Regular verb: frog - froged- froged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can frog
you can frog
she can frog
we can frog
you can frog
they can frog 	I can be froging
you can be froging
she can be froging
we can be froging
you can be froging
they can be froging	I can have froged
you can have froged
she can have froged
we can have froged
you can have froged
they can have froged	I can have been froging
you can have been froging
she can have been froging
we can have been froging
you can have been froging
they can have been froging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot frog
you cannot frog
she cannot frog
we cannot frog
you cannot frog
they cannot frog 	I cannot be froging
you cannot be froging
she cannot be froging
we cannot be froging
you cannot be froging
they cannot be froging	I cannot have froged
you cannot have froged
she cannot have froged
we cannot have froged
you cannot have froged
they cannot have froged	I cannot have been froging
you cannot have been froging
she cannot have been froging
we cannot have been froging
you cannot have been froging
they cannot have been froging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I frog?
can you frog?
can she frog?
can we frog?
can you frog?
can they frog? 	can I be froging?
can you be froging?
can she be froging?
can we be froging?
can you be froging?
can they be froging? 	can I have froged?
can you have froged?
can she have froged?
can we have froged?
can you have froged?
can they have froged? 	can I have been froging?
can you have been froging?
can she have been froging?
can we have been froging?
can you have been froging?
can they have been froging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not frog?
can you not frog?
can she not frog?
can we not frog?
can you not frog?
can they not frog? 	can I not be froging?
can you not be froging?
can she not be froging?
can we not be froging?
can you not be froging?
can they not be froging? 	can I not have froged?
can you not have froged?
can she not have froged?
can we not have froged?
can you not have froged?
can they not have froged? 	can I not have been froging?
can you not have been froging?
can she not have been froging?
can we not have been froging?
can you not have been froging?
can they not have been froging?