I could timetable you could timetable he could timetable we could timetable you could timetable they could timetable
V-ing form
I could be timetabling you could be timetabling he could be timetabling we could be timetabling you could be timetabling they could be timetabling
Perfect
I could have timetabled you could have timetabled he could have timetabled we could have timetabled you could have timetabled they could have timetabled
V-ing perfect
I could have been timetabling you could have been timetabling he could have been timetabling we could have been timetabling you could have been timetabling they could have been timetabling
Negation
Simple form
I could not timetable you could not timetable he could not timetable we could not timetable you could not timetable they could not timetable
V-ing form
I could not be timetabling you could not be timetabling he could not be timetabling we could not be timetabling you could not be timetabling they could not be timetabling
Perfect
I could not have timetabled you could not have timetabled he could not have timetabled we could not have timetabled you could not have timetabled they could not have timetabled
V-ing perfect
I could not have been timetabling you could not have been timetabling he could not have been timetabling we could not have been timetabling you could not have been timetabling they could not have been timetabling
Interrogative form
Simple form
could I timetable? could you timetable? could he timetable? could we timetable? could you timetable? could they timetable?
V-ing form
could I be timetabling? could you be timetabling? could he be timetabling? could we be timetabling? could you be timetabling? could they be timetabling?
Perfect
could I have timetabled? could you have timetabled? could he have timetabled? could we have timetabled? could you have timetabled? could they have timetabled?
V-ing perfect
could I have been timetabling? could you have been timetabling? could he have been timetabling? could we have been timetabling? could you have been timetabling? could they have been timetabling?
Interro-negative form
Simple form
could I not timetable? could you not timetable? could he not timetable? could we not timetable? could you not timetable? could they not timetable?
V-ing form
could I not be timetabling? could you not be timetabling? could he not be timetabling? could we not be timetabling? could you not be timetabling? could they not be timetabling?
Perfect
could I not have timetabled? could you not have timetabled? could he not have timetabled? could we not have timetabled? could you not have timetabled? could they not have timetabled?
V-ing perfect
could I not have been timetabling? could you not have been timetabling? could he not have been timetabling? could we not have been timetabling? could you not have been timetabling? could they not have been timetabling?