I could belabour you could belabour she could belabour we could belabour you could belabour they could belabour
V-ing form
I could be belabouring you could be belabouring she could be belabouring we could be belabouring you could be belabouring they could be belabouring
Perfect
I could have belaboured you could have belaboured she could have belaboured we could have belaboured you could have belaboured they could have belaboured
V-ing perfect
I could have been belabouring you could have been belabouring she could have been belabouring we could have been belabouring you could have been belabouring they could have been belabouring
Negation
Simple form
I couldn't belabour you couldn't belabour she couldn't belabour we couldn't belabour you couldn't belabour they couldn't belabour
V-ing form
I couldn't be belabouring you couldn't be belabouring she couldn't be belabouring we couldn't be belabouring you couldn't be belabouring they couldn't be belabouring
Perfect
I couldn't have belaboured you couldn't have belaboured she couldn't have belaboured we couldn't have belaboured you couldn't have belaboured they couldn't have belaboured
V-ing perfect
I couldn't have been belabouring you couldn't have been belabouring she couldn't have been belabouring we couldn't have been belabouring you couldn't have been belabouring they couldn't have been belabouring
Interrogative form
Simple form
could I belabour? could you belabour? could she belabour? could we belabour? could you belabour? could they belabour?
V-ing form
could I be belabouring? could you be belabouring? could she be belabouring? could we be belabouring? could you be belabouring? could they be belabouring?
Perfect
could I have belaboured? could you have belaboured? could she have belaboured? could we have belaboured? could you have belaboured? could they have belaboured?
V-ing perfect
could I have been belabouring? could you have been belabouring? could she have been belabouring? could we have been belabouring? could you have been belabouring? could they have been belabouring?
Interro-negative form
Simple form
couldn't I belabour? couldn't you belabour? couldn't she belabour? couldn't we belabour? couldn't you belabour? couldn't they belabour?
V-ing form
couldn't I be belabouring? couldn't you be belabouring? couldn't she be belabouring? couldn't we be belabouring? couldn't you be belabouring? couldn't they be belabouring?
Perfect
couldn't I have belaboured? couldn't you have belaboured? couldn't she have belaboured? couldn't we have belaboured? couldn't you have belaboured? couldn't they have belaboured?
V-ing perfect
couldn't I have been belabouring? couldn't you have been belabouring? couldn't she have been belabouring? couldn't we have been belabouring? couldn't you have been belabouring? couldn't they have been belabouring?