could backcheck
Regular verb: backcheck - backchecked- backchecked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could backcheck
you could backcheck
he could backcheck
we could backcheck
you could backcheck
they could backcheck 	I could be backchecking
you could be backchecking
he could be backchecking
we could be backchecking
you could be backchecking
they could be backchecking	I could have backchecked
you could have backchecked
he could have backchecked
we could have backchecked
you could have backchecked
they could have backchecked	I could have been backchecking
you could have been backchecking
he could have been backchecking
we could have been backchecking
you could have been backchecking
they could have been backchecking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't backcheck
you couldn't backcheck
he couldn't backcheck
we couldn't backcheck
you couldn't backcheck
they couldn't backcheck 	I couldn't be backchecking
you couldn't be backchecking
he couldn't be backchecking
we couldn't be backchecking
you couldn't be backchecking
they couldn't be backchecking	I couldn't have backchecked
you couldn't have backchecked
he couldn't have backchecked
we couldn't have backchecked
you couldn't have backchecked
they couldn't have backchecked	I couldn't have been backchecking
you couldn't have been backchecking
he couldn't have been backchecking
we couldn't have been backchecking
you couldn't have been backchecking
they couldn't have been backchecking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I backcheck?
could you backcheck?
could he backcheck?
could we backcheck?
could you backcheck?
could they backcheck? 	could I be backchecking?
could you be backchecking?
could he be backchecking?
could we be backchecking?
could you be backchecking?
could they be backchecking? 	could I have backchecked?
could you have backchecked?
could he have backchecked?
could we have backchecked?
could you have backchecked?
could they have backchecked? 	could I have been backchecking?
could you have been backchecking?
could he have been backchecking?
could we have been backchecking?
could you have been backchecking?
could they have been backchecking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I backcheck?
couldn't you backcheck?
couldn't he backcheck?
couldn't we backcheck?
couldn't you backcheck?
couldn't they backcheck? 	couldn't I be backchecking?
couldn't you be backchecking?
couldn't he be backchecking?
couldn't we be backchecking?
couldn't you be backchecking?
couldn't they be backchecking? 	couldn't I have backchecked?
couldn't you have backchecked?
couldn't he have backchecked?
couldn't we have backchecked?
couldn't you have backchecked?
couldn't they have backchecked? 	couldn't I have been backchecking?
couldn't you have been backchecking?
couldn't he have been backchecking?
couldn't we have been backchecking?
couldn't you have been backchecking?
couldn't they have been backchecking?