could earth
Regular verb: earth - earthed- earthed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could earth
you could earth
he could earth
we could earth
you could earth
they could earth 	I could be earthing
you could be earthing
he could be earthing
we could be earthing
you could be earthing
they could be earthing	I could have earthed
you could have earthed
he 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
he 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 couldn't earth
you couldn't earth
he couldn't earth
we couldn't earth
you couldn't earth
they couldn't earth 	I couldn't be earthing
you couldn't be earthing
he couldn't be earthing
we couldn't be earthing
you couldn't be earthing
they couldn't be earthing	I couldn't have earthed
you couldn't have earthed
he couldn't have earthed
we couldn't have earthed
you couldn't have earthed
they couldn't have earthed	I couldn't have been earthing
you couldn't have been earthing
he couldn't have been earthing
we couldn't have been earthing
you couldn't have been earthing
they couldn't have been earthing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I earth?
could you earth?
could he earth?
could we earth?
could you earth?
could they earth? 	could I be earthing?
could you be earthing?
could he be earthing?
could we be earthing?
could you be earthing?
could they be earthing? 	could I have earthed?
could you have earthed?
could he 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 he 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 	
couldn't I earth?
couldn't you earth?
couldn't he earth?
couldn't we earth?
couldn't you earth?
couldn't they earth? 	couldn't I be earthing?
couldn't you be earthing?
couldn't he be earthing?
couldn't we be earthing?
couldn't you be earthing?
couldn't they be earthing? 	couldn't I have earthed?
couldn't you have earthed?
couldn't he have earthed?
couldn't we have earthed?
couldn't you have earthed?
couldn't they have earthed? 	couldn't I have been earthing?
couldn't you have been earthing?
couldn't he have been earthing?
couldn't we have been earthing?
couldn't you have been earthing?
couldn't they have been earthing?