I can curd you can curd he can curd we can curd you can curd they can curd
V-ing form
I can be curding you can be curding he can be curding we can be curding you can be curding they can be curding
Perfect
I can have curded you can have curded he 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 he 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 he 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 he 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 he 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 he 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 he curd? can we curd? can you curd? can they curd?
V-ing form
can I be curding? can you be curding? can he be curding? can we be curding? can you be curding? can they be curding?
Perfect
can I have curded? can you have curded? can he 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 he 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 he 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 he 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 he 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 he have been curding? can't we have been curding? can't you have been curding? can't they have been curding?