could circumnavigate
Regular verb: circumnavigate - circumnavigated- circumnavigated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
I could not circumnavigate
you could not circumnavigate
he could not circumnavigate
we could not circumnavigate
you could not circumnavigate
they could not circumnavigate 	I could not be circumnavigating
you could not be circumnavigating
he could not be circumnavigating
we could not be circumnavigating
you could not be circumnavigating
they could not be circumnavigating	I could not have circumnavigated
you could not have circumnavigated
he could not have circumnavigated
we could not have circumnavigated
you could not have circumnavigated
they could not have circumnavigated	I could not have been circumnavigating
you could not have been circumnavigating
he could not have been circumnavigating
we could not have been circumnavigating
you could not have been circumnavigating
they could not have been circumnavigating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
could I not circumnavigate?
could you not circumnavigate?
could he not circumnavigate?
could we not circumnavigate?
could you not circumnavigate?
could they not circumnavigate? 	could I not be circumnavigating?
could you not be circumnavigating?
could he not be circumnavigating?
could we not be circumnavigating?
could you not be circumnavigating?
could they not be circumnavigating? 	could I not have circumnavigated?
could you not have circumnavigated?
could he not have circumnavigated?
could we not have circumnavigated?
could you not have circumnavigated?
could they not have circumnavigated? 	could I not have been circumnavigating?
could you not have been circumnavigating?
could he not have been circumnavigating?
could we not have been circumnavigating?
could you not have been circumnavigating?
could they not have been circumnavigating?