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 couldn't spell-check
you couldn't spell-check
she couldn't spell-check
we couldn't spell-check
you couldn't spell-check
they couldn't spell-check 	I couldn't be spell-checking
you couldn't be spell-checking
she couldn't be spell-checking
we couldn't be spell-checking
you couldn't be spell-checking
they couldn't be spell-checking	I couldn't have spell-checked
you couldn't have spell-checked
she couldn't have spell-checked
we couldn't have spell-checked
you couldn't have spell-checked
they couldn't have spell-checked	I couldn't have been spell-checking
you couldn't have been spell-checking
she couldn't have been spell-checking
we couldn't have been spell-checking
you couldn't have been spell-checking
they couldn't 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 	
couldn't I spell-check?
couldn't you spell-check?
couldn't she spell-check?
couldn't we spell-check?
couldn't you spell-check?
couldn't they spell-check? 	couldn't I be spell-checking?
couldn't you be spell-checking?
couldn't she be spell-checking?
couldn't we be spell-checking?
couldn't you be spell-checking?
couldn't they be spell-checking? 	couldn't I have spell-checked?
couldn't you have spell-checked?
couldn't she have spell-checked?
couldn't we have spell-checked?
couldn't you have spell-checked?
couldn't they have spell-checked? 	couldn't I have been spell-checking?
couldn't you have been spell-checking?
couldn't she have been spell-checking?
couldn't we have been spell-checking?
couldn't you have been spell-checking?
couldn't they have been spell-checking?