English verb conjugation
COULD EXCOGITATE

Regular verb: excogitate - excogitated - excogitated

Affirmation

Simple form	V-ing form
I could excogitate you could excogitate he could excogitate we could excogitate you could excogitate they could excogitate	I could be excogitating you could be excogitating he could be excogitating we could be excogitating you could be excogitating they could be excogitating
Perfect	V-ing perfect
I could have excogitated you could have excogitated he could have excogitated we could have excogitated you could have excogitated they could have excogitated	I could have been excogitating you could have been excogitating he could have been excogitating we could have been excogitating you could have been excogitating they could have been excogitating

Negation

Simple form	V-ing form
I couldn't excogitate you couldn't excogitate he couldn't excogitate we couldn't excogitate you couldn't excogitate they couldn't excogitate	I couldn't be excogitating you couldn't be excogitating he couldn't be excogitating we couldn't be excogitating you couldn't be excogitating they couldn't be excogitating
Perfect	V-ing perfect
I couldn't have excogitated you couldn't have excogitated he couldn't have excogitated we couldn't have excogitated you couldn't have excogitated they couldn't have excogitated	I couldn't have been excogitating you couldn't have been excogitating he couldn't have been excogitating we couldn't have been excogitating you couldn't have been excogitating they couldn't have been excogitating

Interrogative form

Simple form	V-ing form
could I excogitate? could you excogitate? could he excogitate? could we excogitate? could you excogitate? could they excogitate?	could I be excogitating? could you be excogitating? could he be excogitating? could we be excogitating? could you be excogitating? could they be excogitating?
Perfect	V-ing perfect
could I have excogitated? could you have excogitated? could he have excogitated? could we have excogitated? could you have excogitated? could they have excogitated?	could I have been excogitating? could you have been excogitating? could he have been excogitating? could we have been excogitating? could you have been excogitating? could they have been excogitating?

Interro-negative form

Simple form	V-ing form
couldn't I excogitate? couldn't you excogitate? couldn't he excogitate? couldn't we excogitate? couldn't you excogitate? couldn't they excogitate?	couldn't I be excogitating? couldn't you be excogitating? couldn't he be excogitating? couldn't we be excogitating? couldn't you be excogitating? couldn't they be excogitating?
Perfect	V-ing perfect
couldn't I have excogitated? couldn't you have excogitated? couldn't he have excogitated? couldn't we have excogitated? couldn't you have excogitated? couldn't they have excogitated?	couldn't I have been excogitating? couldn't you have been excogitating? couldn't he have been excogitating? couldn't we have been excogitating? couldn't you have been excogitating? couldn't they have been excogitating?