English verb conjugation
COULD FROGMARCH

Regular verb: frogmarch - frogmarched - frogmarched

Affirmation

Simple form	V-ing form
I could frogmarch you could frogmarch she could frogmarch we could frogmarch you could frogmarch they could frogmarch	I could be frogmarching you could be frogmarching she 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 she 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 she 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 couldn't frogmarch you couldn't frogmarch she couldn't frogmarch we couldn't frogmarch you couldn't frogmarch they couldn't frogmarch	I couldn't be frogmarching you couldn't be frogmarching she couldn't be frogmarching we couldn't be frogmarching you couldn't be frogmarching they couldn't be frogmarching
Perfect	V-ing perfect
I couldn't have frogmarched you couldn't have frogmarched she couldn't have frogmarched we couldn't have frogmarched you couldn't have frogmarched they couldn't have frogmarched	I couldn't have been frogmarching you couldn't have been frogmarching she couldn't have been frogmarching we couldn't have been frogmarching you couldn't have been frogmarching they couldn't have been frogmarching

Interrogative form

Simple form	V-ing form
could I frogmarch? could you frogmarch? could she frogmarch? could we frogmarch? could you frogmarch? could they frogmarch?	could I be frogmarching? could you be frogmarching? could she 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 she 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 she 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
couldn't I frogmarch? couldn't you frogmarch? couldn't she frogmarch? couldn't we frogmarch? couldn't you frogmarch? couldn't they frogmarch?	couldn't I be frogmarching? couldn't you be frogmarching? couldn't she be frogmarching? couldn't we be frogmarching? couldn't you be frogmarching? couldn't they be frogmarching?
Perfect	V-ing perfect
couldn't I have frogmarched? couldn't you have frogmarched? couldn't she have frogmarched? couldn't we have frogmarched? couldn't you have frogmarched? couldn't they have frogmarched?	couldn't I have been frogmarching? couldn't you have been frogmarching? couldn't she have been frogmarching? couldn't we have been frogmarching? couldn't you have been frogmarching? couldn't they have been frogmarching?