English verb conjugation
CAN FROG

Regular verb: frog - froged - froged

Affirmation

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