Conjugaison du verbe anglais COULD CHECK

I could check
you could check
he could check
we could check
you could check
they could check

I could be checking
you could be checking
he could be checking
we could be checking
you could be checking
they could be checking

I could have checked
you could have checked
he could have checked
we could have checked
you could have checked
they could have checked

I could have been checking
you could have been checking
he could have been checking
we could have been checking
you could have been checking
they could have been checking

I could not check
you could not check
he could not check
we could not check
you could not check
they could not check

I could not be checking
you could not be checking
he could not be checking
we could not be checking
you could not be checking
they could not be checking

I could not have checked
you could not have checked
he could not have checked
we could not have checked
you could not have checked
they could not have checked

I could not have been checking
you could not have been checking
he could not have been checking
we could not have been checking
you could not have been checking
they could not have been checking

could I check?
could you check?
could he check?
could we check?
could you check?
could they check?

could I be checking?
could you be checking?
could he be checking?
could we be checking?
could you be checking?
could they be checking?

could I have checked?
could you have checked?
could he have checked?
could we have checked?
could you have checked?
could they have checked?

could I have been checking?
could you have been checking?
could he have been checking?
could we have been checking?
could you have been checking?
could they have been checking?

could I not check?
could you not check?
could he not check?
could we not check?
could you not check?
could they not check?

could I not be checking?
could you not be checking?
could he not be checking?
could we not be checking?
could you not be checking?
could they not be checking?

could I not have checked?
could you not have checked?
could he not have checked?
could we not have checked?
could you not have checked?
could they not have checked?

could I not have been checking?
could you not have been checking?
could he not have been checking?
could we not have been checking?
could you not have been checking?
could they not have been checking?