could spell-check
Regular verb: spell-check - spell-checked- spell-checked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could spell-check
you could spell-check
she could spell-check
we could spell-check
you could spell-check
they could spell-check 	I could be spell-checking
you could be spell-checking
she could be spell-checking
we could be spell-checking
you could be spell-checking
they could be spell-checking	I could have spell-checked
you could have spell-checked
she could have spell-checked
we could have spell-checked
you could have spell-checked
they could have spell-checked	I could have been spell-checking
you could have been spell-checking
she could have been spell-checking
we could have been spell-checking
you could have been spell-checking
they could have been spell-checking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not spell-check
you could not spell-check
she could not spell-check
we could not spell-check
you could not spell-check
they could not spell-check 	I could not be spell-checking
you could not be spell-checking
she could not be spell-checking
we could not be spell-checking
you could not be spell-checking
they could not be spell-checking	I could not have spell-checked
you could not have spell-checked
she could not have spell-checked
we could not have spell-checked
you could not have spell-checked
they could not have spell-checked	I could not have been spell-checking
you could not have been spell-checking
she could not have been spell-checking
we could not have been spell-checking
you could not have been spell-checking
they could not have been spell-checking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spell-check?
could you spell-check?
could she spell-check?
could we spell-check?
could you spell-check?
could they spell-check? 	could I be spell-checking?
could you be spell-checking?
could she be spell-checking?
could we be spell-checking?
could you be spell-checking?
could they be spell-checking? 	could I have spell-checked?
could you have spell-checked?
could she have spell-checked?
could we have spell-checked?
could you have spell-checked?
could they have spell-checked? 	could I have been spell-checking?
could you have been spell-checking?
could she have been spell-checking?
could we have been spell-checking?
could you have been spell-checking?
could they have been spell-checking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not spell-check?
could you not spell-check?
could she not spell-check?
could we not spell-check?
could you not spell-check?
could they not spell-check? 	could I not be spell-checking?
could you not be spell-checking?
could she not be spell-checking?
could we not be spell-checking?
could you not be spell-checking?
could they not be spell-checking? 	could I not have spell-checked?
could you not have spell-checked?
could she not have spell-checked?
could we not have spell-checked?
could you not have spell-checked?
could they not have spell-checked? 	could I not have been spell-checking?
could you not have been spell-checking?
could she not have been spell-checking?
could we not have been spell-checking?
could you not have been spell-checking?
could they not have been spell-checking?