I can curd you can curd she can curd we can curd you can curd they can curd
V-ing form
I can be curding you can be curding she can be curding we can be curding you can be curding they can be curding
Perfect
I can have curded you can have curded she can have curded we can have curded you can have curded they can have curded
V-ing perfect
I can have been curding you can have been curding she can have been curding we can have been curding you can have been curding they can have been curding
Negation
Simple form
I can't curd you can't curd she can't curd we can't curd you can't curd they can't curd
V-ing form
I can't be curding you can't be curding she can't be curding we can't be curding you can't be curding they can't be curding
Perfect
I can't have curded you can't have curded she can't have curded we can't have curded you can't have curded they can't have curded
V-ing perfect
I can't have been curding you can't have been curding she can't have been curding we can't have been curding you can't have been curding they can't have been curding
Interrogative form
Simple form
can I curd? can you curd? can she curd? can we curd? can you curd? can they curd?
V-ing form
can I be curding? can you be curding? can she be curding? can we be curding? can you be curding? can they be curding?
Perfect
can I have curded? can you have curded? can she have curded? can we have curded? can you have curded? can they have curded?
V-ing perfect
can I have been curding? can you have been curding? can she have been curding? can we have been curding? can you have been curding? can they have been curding?
Interro-negative form
Simple form
can't I curd? can't you curd? can't she curd? can't we curd? can't you curd? can't they curd?
V-ing form
can't I be curding? can't you be curding? can't she be curding? can't we be curding? can't you be curding? can't they be curding?
Perfect
can't I have curded? can't you have curded? can't she have curded? can't we have curded? can't you have curded? can't they have curded?
V-ing perfect
can't I have been curding? can't you have been curding? can't she have been curding? can't we have been curding? can't you have been curding? can't they have been curding?