English verb conjugation
COULD HELICOPTER

Regular verb: helicopter - helicoptered - helicoptered

Affirmation

Simple form	V-ing form
I could helicopter you could helicopter he could helicopter we could helicopter you could helicopter they could helicopter	I could be helicoptering you could be helicoptering he could be helicoptering we could be helicoptering you could be helicoptering they could be helicoptering
Perfect	V-ing perfect
I could have helicoptered you could have helicoptered he could have helicoptered we could have helicoptered you could have helicoptered they could have helicoptered	I could have been helicoptering you could have been helicoptering he could have been helicoptering we could have been helicoptering you could have been helicoptering they could have been helicoptering

Negation

Simple form	V-ing form
I couldn't helicopter you couldn't helicopter he couldn't helicopter we couldn't helicopter you couldn't helicopter they couldn't helicopter	I couldn't be helicoptering you couldn't be helicoptering he couldn't be helicoptering we couldn't be helicoptering you couldn't be helicoptering they couldn't be helicoptering
Perfect	V-ing perfect
I couldn't have helicoptered you couldn't have helicoptered he couldn't have helicoptered we couldn't have helicoptered you couldn't have helicoptered they couldn't have helicoptered	I couldn't have been helicoptering you couldn't have been helicoptering he couldn't have been helicoptering we couldn't have been helicoptering you couldn't have been helicoptering they couldn't have been helicoptering

Interrogative form

Simple form	V-ing form
could I helicopter? could you helicopter? could he helicopter? could we helicopter? could you helicopter? could they helicopter?	could I be helicoptering? could you be helicoptering? could he be helicoptering? could we be helicoptering? could you be helicoptering? could they be helicoptering?
Perfect	V-ing perfect
could I have helicoptered? could you have helicoptered? could he have helicoptered? could we have helicoptered? could you have helicoptered? could they have helicoptered?	could I have been helicoptering? could you have been helicoptering? could he have been helicoptering? could we have been helicoptering? could you have been helicoptering? could they have been helicoptering?

Interro-negative form

Simple form	V-ing form
couldn't I helicopter? couldn't you helicopter? couldn't he helicopter? couldn't we helicopter? couldn't you helicopter? couldn't they helicopter?	couldn't I be helicoptering? couldn't you be helicoptering? couldn't he be helicoptering? couldn't we be helicoptering? couldn't you be helicoptering? couldn't they be helicoptering?
Perfect	V-ing perfect
couldn't I have helicoptered? couldn't you have helicoptered? couldn't he have helicoptered? couldn't we have helicoptered? couldn't you have helicoptered? couldn't they have helicoptered?	couldn't I have been helicoptering? couldn't you have been helicoptering? couldn't he have been helicoptering? couldn't we have been helicoptering? couldn't you have been helicoptering? couldn't they have been helicoptering?