I could tenter you could tenter he could tenter we could tenter you could tenter they could tenter
V-ing form
I could be tentering you could be tentering he could be tentering we could be tentering you could be tentering they could be tentering
Perfect
I could have tentered you could have tentered he could have tentered we could have tentered you could have tentered they could have tentered
V-ing perfect
I could have been tentering you could have been tentering he could have been tentering we could have been tentering you could have been tentering they could have been tentering
Negation
Simple form
I could not tenter you could not tenter he could not tenter we could not tenter you could not tenter they could not tenter
V-ing form
I could not be tentering you could not be tentering he could not be tentering we could not be tentering you could not be tentering they could not be tentering
Perfect
I could not have tentered you could not have tentered he could not have tentered we could not have tentered you could not have tentered they could not have tentered
V-ing perfect
I could not have been tentering you could not have been tentering he could not have been tentering we could not have been tentering you could not have been tentering they could not have been tentering
Interrogative form
Simple form
could I tenter? could you tenter? could he tenter? could we tenter? could you tenter? could they tenter?
V-ing form
could I be tentering? could you be tentering? could he be tentering? could we be tentering? could you be tentering? could they be tentering?
Perfect
could I have tentered? could you have tentered? could he have tentered? could we have tentered? could you have tentered? could they have tentered?
V-ing perfect
could I have been tentering? could you have been tentering? could he have been tentering? could we have been tentering? could you have been tentering? could they have been tentering?
Interro-negative form
Simple form
could I not tenter? could you not tenter? could he not tenter? could we not tenter? could you not tenter? could they not tenter?
V-ing form
could I not be tentering? could you not be tentering? could he not be tentering? could we not be tentering? could you not be tentering? could they not be tentering?
Perfect
could I not have tentered? could you not have tentered? could he not have tentered? could we not have tentered? could you not have tentered? could they not have tentered?
V-ing perfect
could I not have been tentering? could you not have been tentering? could he not have been tentering? could we not have been tentering? could you not have been tentering? could they not have been tentering?