English verb conjugation
CAN LEAPFROG

Regular verb: leapfrog - leapfroged - leapfroged

Affirmation

Simple form	V-ing form
I can leapfrog you can leapfrog she can leapfrog we can leapfrog you can leapfrog they can leapfrog	I can be leapfroging you can be leapfroging she 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 she 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 she 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 she 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 she 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 she 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 she 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 she leapfrog? can we leapfrog? can you leapfrog? can they leapfrog?	can I be leapfroging? can you be leapfroging? can she 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 she 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 she 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 she 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 she 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 she 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 she have been leapfroging? can't we have been leapfroging? can't you have been leapfroging? can't they have been leapfroging?