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 couldn't harvest
you couldn't harvest
he couldn't harvest
we couldn't harvest
you couldn't harvest
they couldn't harvest 	I couldn't be harvesting
you couldn't be harvesting
he couldn't be harvesting
we couldn't be harvesting
you couldn't be harvesting
they couldn't be harvesting	I couldn't have harvested
you couldn't have harvested
he couldn't have harvested
we couldn't have harvested
you couldn't have harvested
they couldn't have harvested	I couldn't have been harvesting
you couldn't have been harvesting
he couldn't have been harvesting
we couldn't have been harvesting
you couldn't have been harvesting
they couldn't 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 	
couldn't I harvest?
couldn't you harvest?
couldn't he harvest?
couldn't we harvest?
couldn't you harvest?
couldn't they harvest? 	couldn't I be harvesting?
couldn't you be harvesting?
couldn't he be harvesting?
couldn't we be harvesting?
couldn't you be harvesting?
couldn't they be harvesting? 	couldn't I have harvested?
couldn't you have harvested?
couldn't he have harvested?
couldn't we have harvested?
couldn't you have harvested?
couldn't they have harvested? 	couldn't I have been harvesting?
couldn't you have been harvesting?
couldn't he have been harvesting?
couldn't we have been harvesting?
couldn't you have been harvesting?
couldn't they have been harvesting?