I could enure you could enure he could enure we could enure you could enure they could enure
V-ing form
I could be enuring you could be enuring he could be enuring we could be enuring you could be enuring they could be enuring
Perfect
I could have enured you could have enured he could have enured we could have enured you could have enured they could have enured
V-ing perfect
I could have been enuring you could have been enuring he could have been enuring we could have been enuring you could have been enuring they could have been enuring
Negation
Simple form
I could not enure you could not enure he could not enure we could not enure you could not enure they could not enure
V-ing form
I could not be enuring you could not be enuring he could not be enuring we could not be enuring you could not be enuring they could not be enuring
Perfect
I could not have enured you could not have enured he could not have enured we could not have enured you could not have enured they could not have enured
V-ing perfect
I could not have been enuring you could not have been enuring he could not have been enuring we could not have been enuring you could not have been enuring they could not have been enuring
Interrogative form
Simple form
could I enure? could you enure? could he enure? could we enure? could you enure? could they enure?
V-ing form
could I be enuring? could you be enuring? could he be enuring? could we be enuring? could you be enuring? could they be enuring?
Perfect
could I have enured? could you have enured? could he have enured? could we have enured? could you have enured? could they have enured?
V-ing perfect
could I have been enuring? could you have been enuring? could he have been enuring? could we have been enuring? could you have been enuring? could they have been enuring?
Interro-negative form
Simple form
could I not enure? could you not enure? could he not enure? could we not enure? could you not enure? could they not enure?
V-ing form
could I not be enuring? could you not be enuring? could he not be enuring? could we not be enuring? could you not be enuring? could they not be enuring?
Perfect
could I not have enured? could you not have enured? could he not have enured? could we not have enured? could you not have enured? could they not have enured?
V-ing perfect
could I not have been enuring? could you not have been enuring? could he not have been enuring? could we not have been enuring? could you not have been enuring? could they not have been enuring?