English verb conjugation
CAN LEAPFROG

Regular verb: leapfrog - leapfroged - leapfroged

Affirmation

Simple form	V-ing form
I can leapfrog you can leapfrog he can leapfrog we can leapfrog you can leapfrog they can leapfrog	I can be leapfroging you can be leapfroging he can be leapfroging we can be leapfroging you can be leapfroging they can be leapfroging
Perfect	V-ing perfect
I can have leapfroged you can have leapfroged he can have leapfroged we can have leapfroged you can have leapfroged they can have leapfroged	I can have been leapfroging you can have been leapfroging he can have been leapfroging we can have been leapfroging you can have been leapfroging they can have been leapfroging

Negation

Simple form	V-ing form
I can't leapfrog you can't leapfrog he can't leapfrog we can't leapfrog you can't leapfrog they can't leapfrog	I can't be leapfroging you can't be leapfroging he can't be leapfroging we can't be leapfroging you can't be leapfroging they can't be leapfroging
Perfect	V-ing perfect
I can't have leapfroged you can't have leapfroged he can't have leapfroged we can't have leapfroged you can't have leapfroged they can't have leapfroged	I can't have been leapfroging you can't have been leapfroging he can't have been leapfroging we can't have been leapfroging you can't have been leapfroging they can't have been leapfroging

Interrogative form

Simple form	V-ing form
can I leapfrog? can you leapfrog? can he leapfrog? can we leapfrog? can you leapfrog? can they leapfrog?	can I be leapfroging? can you be leapfroging? can he be leapfroging? can we be leapfroging? can you be leapfroging? can they be leapfroging?
Perfect	V-ing perfect
can I have leapfroged? can you have leapfroged? can he have leapfroged? can we have leapfroged? can you have leapfroged? can they have leapfroged?	can I have been leapfroging? can you have been leapfroging? can he have been leapfroging? can we have been leapfroging? can you have been leapfroging? can they have been leapfroging?

Interro-negative form

Simple form	V-ing form
can't I leapfrog? can't you leapfrog? can't he leapfrog? can't we leapfrog? can't you leapfrog? can't they leapfrog?	can't I be leapfroging? can't you be leapfroging? can't he be leapfroging? can't we be leapfroging? can't you be leapfroging? can't they be leapfroging?
Perfect	V-ing perfect
can't I have leapfroged? can't you have leapfroged? can't he have leapfroged? can't we have leapfroged? can't you have leapfroged? can't they have leapfroged?	can't I have been leapfroging? can't you have been leapfroging? can't he have been leapfroging? can't we have been leapfroging? can't you have been leapfroging? can't they have been leapfroging?