English verb conjugation
COULD LEAPFROG

Regular verb: leapfrog - leapfroged - leapfroged

Affirmation

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

Negation

Simple form	V-ing form
I could not leapfrog you could not leapfrog he could not leapfrog we could not leapfrog you could not leapfrog they could not leapfrog	I could not be leapfroging you could not be leapfroging he could not be leapfroging we could not be leapfroging you could not be leapfroging they could not be leapfroging
Perfect	V-ing perfect
I could not have leapfroged you could not have leapfroged he could not have leapfroged we could not have leapfroged you could not have leapfroged they could not have leapfroged	I could not have been leapfroging you could not have been leapfroging he could not have been leapfroging we could not have been leapfroging you could not have been leapfroging they could not have been leapfroging

Interrogative form

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

Interro-negative form

Simple form	V-ing form
could I not leapfrog? could you not leapfrog? could he not leapfrog? could we not leapfrog? could you not leapfrog? could they not leapfrog?	could I not be leapfroging? could you not be leapfroging? could he not be leapfroging? could we not be leapfroging? could you not be leapfroging? could they not be leapfroging?
Perfect	V-ing perfect
could I not have leapfroged? could you not have leapfroged? could he not have leapfroged? could we not have leapfroged? could you not have leapfroged? could they not have leapfroged?	could I not have been leapfroging? could you not have been leapfroging? could he not have been leapfroging? could we not have been leapfroging? could you not have been leapfroging? could they not have been leapfroging?