can harvest
Regular verb: harvest - harvested- harvested

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't harvest
you can't harvest
she can't harvest
we can't harvest
you can't harvest
they can't harvest 	I can't be harvesting
you can't be harvesting
she can't be harvesting
we can't be harvesting
you can't be harvesting
they can't be harvesting	I can't have harvested
you can't have harvested
she can't have harvested
we can't have harvested
you can't have harvested
they can't have harvested	I can't have been harvesting
you can't have been harvesting
she can't have been harvesting
we can't have been harvesting
you can't have been harvesting
they can't have been harvesting	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I harvest?
can't you harvest?
can't she harvest?
can't we harvest?
can't you harvest?
can't they harvest? 	can't I be harvesting?
can't you be harvesting?
can't she be harvesting?
can't we be harvesting?
can't you be harvesting?
can't they be harvesting? 	can't I have harvested?
can't you have harvested?
can't she have harvested?
can't we have harvested?
can't you have harvested?
can't they have harvested? 	can't I have been harvesting?
can't you have been harvesting?
can't she have been harvesting?
can't we have been harvesting?
can't you have been harvesting?
can't they have been harvesting?