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 couldn't enure you couldn't enure he couldn't enure we couldn't enure you couldn't enure they couldn't enure
V-ing form
I couldn't be enuring you couldn't be enuring he couldn't be enuring we couldn't be enuring you couldn't be enuring they couldn't be enuring
Perfect
I couldn't have enured you couldn't have enured he couldn't have enured we couldn't have enured you couldn't have enured they couldn't have enured
V-ing perfect
I couldn't have been enuring you couldn't have been enuring he couldn't have been enuring we couldn't have been enuring you couldn't have been enuring they couldn't 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
couldn't I enure? couldn't you enure? couldn't he enure? couldn't we enure? couldn't you enure? couldn't they enure?
V-ing form
couldn't I be enuring? couldn't you be enuring? couldn't he be enuring? couldn't we be enuring? couldn't you be enuring? couldn't they be enuring?
Perfect
couldn't I have enured? couldn't you have enured? couldn't he have enured? couldn't we have enured? couldn't you have enured? couldn't they have enured?
V-ing perfect
couldn't I have been enuring? couldn't you have been enuring? couldn't he have been enuring? couldn't we have been enuring? couldn't you have been enuring? couldn't they have been enuring?