English verb conjugation
COULD SPELL-CHECK

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

Affirmation

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