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 can't frog you can't frog he can't frog we can't frog you can't frog they can't frog	I can't be froging you can't be froging he can't be froging we can't be froging you can't be froging they can't be froging
Perfect	V-ing perfect
I can't have froged you can't have froged he can't have froged we can't have froged you can't have froged they can't have froged	I can't have been froging you can't have been froging he can't have been froging we can't have been froging you can't have been froging they can't 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't I frog? can't you frog? can't he frog? can't we frog? can't you frog? can't they frog?	can't I be froging? can't you be froging? can't he be froging? can't we be froging? can't you be froging? can't they be froging?
Perfect	V-ing perfect
can't I have froged? can't you have froged? can't he have froged? can't we have froged? can't you have froged? can't they have froged?	can't I have been froging? can't you have been froging? can't he have been froging? can't we have been froging? can't you have been froging? can't they have been froging?