could moss
Regular verb: moss - mossed- mossed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could moss
you could moss
he could moss
we could moss
you could moss
they could moss 	I could be mossing
you could be mossing
he could be mossing
we could be mossing
you could be mossing
they could be mossing	I could have mossed
you could have mossed
he could have mossed
we could have mossed
you could have mossed
they could have mossed	I could have been mossing
you could have been mossing
he could have been mossing
we could have been mossing
you could have been mossing
they could have been mossing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not moss
you could not moss
he could not moss
we could not moss
you could not moss
they could not moss 	I could not be mossing
you could not be mossing
he could not be mossing
we could not be mossing
you could not be mossing
they could not be mossing	I could not have mossed
you could not have mossed
he could not have mossed
we could not have mossed
you could not have mossed
they could not have mossed	I could not have been mossing
you could not have been mossing
he could not have been mossing
we could not have been mossing
you could not have been mossing
they could not have been mossing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I moss?
could you moss?
could he moss?
could we moss?
could you moss?
could they moss? 	could I be mossing?
could you be mossing?
could he be mossing?
could we be mossing?
could you be mossing?
could they be mossing? 	could I have mossed?
could you have mossed?
could he have mossed?
could we have mossed?
could you have mossed?
could they have mossed? 	could I have been mossing?
could you have been mossing?
could he have been mossing?
could we have been mossing?
could you have been mossing?
could they have been mossing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not moss?
could you not moss?
could he not moss?
could we not moss?
could you not moss?
could they not moss? 	could I not be mossing?
could you not be mossing?
could he not be mossing?
could we not be mossing?
could you not be mossing?
could they not be mossing? 	could I not have mossed?
could you not have mossed?
could he not have mossed?
could we not have mossed?
could you not have mossed?
could they not have mossed? 	could I not have been mossing?
could you not have been mossing?
could he not have been mossing?
could we not have been mossing?
could you not have been mossing?
could they not have been mossing?