could fax
Regular verb: fax - faxed- faxed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fax
you could fax
she could fax
we could fax
you could fax
they could fax 	I could be faxing
you could be faxing
she could be faxing
we could be faxing
you could be faxing
they could be faxing	I could have faxed
you could have faxed
she could have faxed
we could have faxed
you could have faxed
they could have faxed	I could have been faxing
you could have been faxing
she could have been faxing
we could have been faxing
you could have been faxing
they could have been faxing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't fax
you couldn't fax
she couldn't fax
we couldn't fax
you couldn't fax
they couldn't fax 	I couldn't be faxing
you couldn't be faxing
she couldn't be faxing
we couldn't be faxing
you couldn't be faxing
they couldn't be faxing	I couldn't have faxed
you couldn't have faxed
she couldn't have faxed
we couldn't have faxed
you couldn't have faxed
they couldn't have faxed	I couldn't have been faxing
you couldn't have been faxing
she couldn't have been faxing
we couldn't have been faxing
you couldn't have been faxing
they couldn't have been faxing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fax?
could you fax?
could she fax?
could we fax?
could you fax?
could they fax? 	could I be faxing?
could you be faxing?
could she be faxing?
could we be faxing?
could you be faxing?
could they be faxing? 	could I have faxed?
could you have faxed?
could she have faxed?
could we have faxed?
could you have faxed?
could they have faxed? 	could I have been faxing?
could you have been faxing?
could she have been faxing?
could we have been faxing?
could you have been faxing?
could they have been faxing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I fax?
couldn't you fax?
couldn't she fax?
couldn't we fax?
couldn't you fax?
couldn't they fax? 	couldn't I be faxing?
couldn't you be faxing?
couldn't she be faxing?
couldn't we be faxing?
couldn't you be faxing?
couldn't they be faxing? 	couldn't I have faxed?
couldn't you have faxed?
couldn't she have faxed?
couldn't we have faxed?
couldn't you have faxed?
couldn't they have faxed? 	couldn't I have been faxing?
couldn't you have been faxing?
couldn't she have been faxing?
couldn't we have been faxing?
couldn't you have been faxing?
couldn't they have been faxing?