could earth
Regular verb: earth - earthed- earthed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could earth
you could earth
she could earth
we could earth
you could earth
they could earth 	I could be earthing
you could be earthing
she could be earthing
we could be earthing
you could be earthing
they could be earthing	I could have earthed
you could have earthed
she could have earthed
we could have earthed
you could have earthed
they could have earthed	I could have been earthing
you could have been earthing
she could have been earthing
we could have been earthing
you could have been earthing
they could have been earthing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not earth
you could not earth
she could not earth
we could not earth
you could not earth
they could not earth 	I could not be earthing
you could not be earthing
she could not be earthing
we could not be earthing
you could not be earthing
they could not be earthing	I could not have earthed
you could not have earthed
she could not have earthed
we could not have earthed
you could not have earthed
they could not have earthed	I could not have been earthing
you could not have been earthing
she could not have been earthing
we could not have been earthing
you could not have been earthing
they could not have been earthing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I earth?
could you earth?
could she earth?
could we earth?
could you earth?
could they earth? 	could I be earthing?
could you be earthing?
could she be earthing?
could we be earthing?
could you be earthing?
could they be earthing? 	could I have earthed?
could you have earthed?
could she have earthed?
could we have earthed?
could you have earthed?
could they have earthed? 	could I have been earthing?
could you have been earthing?
could she have been earthing?
could we have been earthing?
could you have been earthing?
could they have been earthing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not earth?
could you not earth?
could she not earth?
could we not earth?
could you not earth?
could they not earth? 	could I not be earthing?
could you not be earthing?
could she not be earthing?
could we not be earthing?
could you not be earthing?
could they not be earthing? 	could I not have earthed?
could you not have earthed?
could she not have earthed?
could we not have earthed?
could you not have earthed?
could they not have earthed? 	could I not have been earthing?
could you not have been earthing?
could she not have been earthing?
could we not have been earthing?
could you not have been earthing?
could they not have been earthing?