English verb conjugation
COULD FROGMARCH

Regular verb: frogmarch - frogmarched - frogmarched

Affirmation

Simple form	V-ing form
I could frogmarch you could frogmarch he could frogmarch we could frogmarch you could frogmarch they could frogmarch	I could be frogmarching you could be frogmarching he could be frogmarching we could be frogmarching you could be frogmarching they could be frogmarching
Perfect	V-ing perfect
I could have frogmarched you could have frogmarched he could have frogmarched we could have frogmarched you could have frogmarched they could have frogmarched	I could have been frogmarching you could have been frogmarching he could have been frogmarching we could have been frogmarching you could have been frogmarching they could have been frogmarching

Negation

Simple form	V-ing form
I could not frogmarch you could not frogmarch he could not frogmarch we could not frogmarch you could not frogmarch they could not frogmarch	I could not be frogmarching you could not be frogmarching he could not be frogmarching we could not be frogmarching you could not be frogmarching they could not be frogmarching
Perfect	V-ing perfect
I could not have frogmarched you could not have frogmarched he could not have frogmarched we could not have frogmarched you could not have frogmarched they could not have frogmarched	I could not have been frogmarching you could not have been frogmarching he could not have been frogmarching we could not have been frogmarching you could not have been frogmarching they could not have been frogmarching

Interrogative form

Simple form	V-ing form
could I frogmarch? could you frogmarch? could he frogmarch? could we frogmarch? could you frogmarch? could they frogmarch?	could I be frogmarching? could you be frogmarching? could he be frogmarching? could we be frogmarching? could you be frogmarching? could they be frogmarching?
Perfect	V-ing perfect
could I have frogmarched? could you have frogmarched? could he have frogmarched? could we have frogmarched? could you have frogmarched? could they have frogmarched?	could I have been frogmarching? could you have been frogmarching? could he have been frogmarching? could we have been frogmarching? could you have been frogmarching? could they have been frogmarching?

Interro-negative form

Simple form	V-ing form
could I not frogmarch? could you not frogmarch? could he not frogmarch? could we not frogmarch? could you not frogmarch? could they not frogmarch?	could I not be frogmarching? could you not be frogmarching? could he not be frogmarching? could we not be frogmarching? could you not be frogmarching? could they not be frogmarching?
Perfect	V-ing perfect
could I not have frogmarched? could you not have frogmarched? could he not have frogmarched? could we not have frogmarched? could you not have frogmarched? could they not have frogmarched?	could I not have been frogmarching? could you not have been frogmarching? could he not have been frogmarching? could we not have been frogmarching? could you not have been frogmarching? could they not have been frogmarching?