could harvest
Regular verb: harvest - harvested- harvested

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could harvest
you could harvest
he could harvest
we could harvest
you could harvest
they could harvest 	I could be harvesting
you could be harvesting
he could be harvesting
we could be harvesting
you could be harvesting
they could be harvesting	I could have harvested
you could have harvested
he could have harvested
we could have harvested
you could have harvested
they could have harvested	I could have been harvesting
you could have been harvesting
he could have been harvesting
we could have been harvesting
you could have been harvesting
they could have been harvesting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not harvest
you could not harvest
he could not harvest
we could not harvest
you could not harvest
they could not harvest 	I could not be harvesting
you could not be harvesting
he could not be harvesting
we could not be harvesting
you could not be harvesting
they could not be harvesting	I could not have harvested
you could not have harvested
he could not have harvested
we could not have harvested
you could not have harvested
they could not have harvested	I could not have been harvesting
you could not have been harvesting
he could not have been harvesting
we could not have been harvesting
you could not have been harvesting
they could not have been harvesting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I harvest?
could you harvest?
could he harvest?
could we harvest?
could you harvest?
could they harvest? 	could I be harvesting?
could you be harvesting?
could he be harvesting?
could we be harvesting?
could you be harvesting?
could they be harvesting? 	could I have harvested?
could you have harvested?
could he have harvested?
could we have harvested?
could you have harvested?
could they have harvested? 	could I have been harvesting?
could you have been harvesting?
could he have been harvesting?
could we have been harvesting?
could you have been harvesting?
could they have been harvesting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not harvest?
could you not harvest?
could he not harvest?
could we not harvest?
could you not harvest?
could they not harvest? 	could I not be harvesting?
could you not be harvesting?
could he not be harvesting?
could we not be harvesting?
could you not be harvesting?
could they not be harvesting? 	could I not have harvested?
could you not have harvested?
could he not have harvested?
could we not have harvested?
could you not have harvested?
could they not have harvested? 	could I not have been harvesting?
could you not have been harvesting?
could he not have been harvesting?
could we not have been harvesting?
could you not have been harvesting?
could they not have been harvesting?