can prework
Regular verb: prework - preworked- preworked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can prework
you can prework
he can prework
we can prework
you can prework
they can prework 	I can be preworking
you can be preworking
he can be preworking
we can be preworking
you can be preworking
they can be preworking	I can have preworked
you can have preworked
he can have preworked
we can have preworked
you can have preworked
they can have preworked	I can have been preworking
you can have been preworking
he can have been preworking
we can have been preworking
you can have been preworking
they can have been preworking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't prework
you can't prework
he can't prework
we can't prework
you can't prework
they can't prework 	I can't be preworking
you can't be preworking
he can't be preworking
we can't be preworking
you can't be preworking
they can't be preworking	I can't have preworked
you can't have preworked
he can't have preworked
we can't have preworked
you can't have preworked
they can't have preworked	I can't have been preworking
you can't have been preworking
he can't have been preworking
we can't have been preworking
you can't have been preworking
they can't have been preworking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I prework?
can you prework?
can he prework?
can we prework?
can you prework?
can they prework? 	can I be preworking?
can you be preworking?
can he be preworking?
can we be preworking?
can you be preworking?
can they be preworking? 	can I have preworked?
can you have preworked?
can he have preworked?
can we have preworked?
can you have preworked?
can they have preworked? 	can I have been preworking?
can you have been preworking?
can he have been preworking?
can we have been preworking?
can you have been preworking?
can they have been preworking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I prework?
can't you prework?
can't he prework?
can't we prework?
can't you prework?
can't they prework? 	can't I be preworking?
can't you be preworking?
can't he be preworking?
can't we be preworking?
can't you be preworking?
can't they be preworking? 	can't I have preworked?
can't you have preworked?
can't he have preworked?
can't we have preworked?
can't you have preworked?
can't they have preworked? 	can't I have been preworking?
can't you have been preworking?
can't he have been preworking?
can't we have been preworking?
can't you have been preworking?
can't they have been preworking?