English verb conjugation
COULD TIMETABLE

Regular verb: timetable - timetabled - timetabled

Affirmation

Simple form	V-ing form
I could timetable you could timetable he could timetable we could timetable you could timetable they could timetable	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	V-ing 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	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	V-ing form
I couldn't timetable you couldn't timetable he couldn't timetable we couldn't timetable you couldn't timetable they couldn't timetable	I couldn't be timetabling you couldn't be timetabling he couldn't be timetabling we couldn't be timetabling you couldn't be timetabling they couldn't be timetabling
Perfect	V-ing perfect
I couldn't have timetabled you couldn't have timetabled he couldn't have timetabled we couldn't have timetabled you couldn't have timetabled they couldn't have timetabled	I couldn't have been timetabling you couldn't have been timetabling he couldn't have been timetabling we couldn't have been timetabling you couldn't have been timetabling they couldn't have been timetabling

Interrogative form

Simple form	V-ing form
could I timetable? could you timetable? could he timetable? could we timetable? could you timetable? could they timetable?	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	V-ing 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?	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	V-ing form
couldn't I timetable? couldn't you timetable? couldn't he timetable? couldn't we timetable? couldn't you timetable? couldn't they timetable?	couldn't I be timetabling? couldn't you be timetabling? couldn't he be timetabling? couldn't we be timetabling? couldn't you be timetabling? couldn't they be timetabling?
Perfect	V-ing perfect
couldn't I have timetabled? couldn't you have timetabled? couldn't he have timetabled? couldn't we have timetabled? couldn't you have timetabled? couldn't they have timetabled?	couldn't I have been timetabling? couldn't you have been timetabling? couldn't he have been timetabling? couldn't we have been timetabling? couldn't you have been timetabling? couldn't they have been timetabling?