English verb conjugation
COULD CIRCUMNAVIGATE

Regular verb: circumnavigate - circumnavigated - circumnavigated

Affirmation

Simple form	V-ing form
I could circumnavigate you could circumnavigate he could circumnavigate we could circumnavigate you could circumnavigate they could circumnavigate	I could be circumnavigating you could be circumnavigating he could be circumnavigating we could be circumnavigating you could be circumnavigating they could be circumnavigating
Perfect	V-ing perfect
I could have circumnavigated you could have circumnavigated he could have circumnavigated we could have circumnavigated you could have circumnavigated they could have circumnavigated	I could have been circumnavigating you could have been circumnavigating he could have been circumnavigating we could have been circumnavigating you could have been circumnavigating they could have been circumnavigating

Negation

Simple form	V-ing form
I couldn't circumnavigate you couldn't circumnavigate he couldn't circumnavigate we couldn't circumnavigate you couldn't circumnavigate they couldn't circumnavigate	I couldn't be circumnavigating you couldn't be circumnavigating he couldn't be circumnavigating we couldn't be circumnavigating you couldn't be circumnavigating they couldn't be circumnavigating
Perfect	V-ing perfect
I couldn't have circumnavigated you couldn't have circumnavigated he couldn't have circumnavigated we couldn't have circumnavigated you couldn't have circumnavigated they couldn't have circumnavigated	I couldn't have been circumnavigating you couldn't have been circumnavigating he couldn't have been circumnavigating we couldn't have been circumnavigating you couldn't have been circumnavigating they couldn't have been circumnavigating

Interrogative form

Simple form	V-ing form
could I circumnavigate? could you circumnavigate? could he circumnavigate? could we circumnavigate? could you circumnavigate? could they circumnavigate?	could I be circumnavigating? could you be circumnavigating? could he be circumnavigating? could we be circumnavigating? could you be circumnavigating? could they be circumnavigating?
Perfect	V-ing perfect
could I have circumnavigated? could you have circumnavigated? could he have circumnavigated? could we have circumnavigated? could you have circumnavigated? could they have circumnavigated?	could I have been circumnavigating? could you have been circumnavigating? could he have been circumnavigating? could we have been circumnavigating? could you have been circumnavigating? could they have been circumnavigating?

Interro-negative form

Simple form	V-ing form
couldn't I circumnavigate? couldn't you circumnavigate? couldn't he circumnavigate? couldn't we circumnavigate? couldn't you circumnavigate? couldn't they circumnavigate?	couldn't I be circumnavigating? couldn't you be circumnavigating? couldn't he be circumnavigating? couldn't we be circumnavigating? couldn't you be circumnavigating? couldn't they be circumnavigating?
Perfect	V-ing perfect
couldn't I have circumnavigated? couldn't you have circumnavigated? couldn't he have circumnavigated? couldn't we have circumnavigated? couldn't you have circumnavigated? couldn't they have circumnavigated?	couldn't I have been circumnavigating? couldn't you have been circumnavigating? couldn't he have been circumnavigating? couldn't we have been circumnavigating? couldn't you have been circumnavigating? couldn't they have been circumnavigating?