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