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