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