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 cannot curd you cannot curd she cannot curd we cannot curd you cannot curd they cannot curd
V-ing form
I cannot be curding you cannot be curding she cannot be curding we cannot be curding you cannot be curding they cannot be curding
Perfect
I cannot have curded you cannot have curded she cannot have curded we cannot have curded you cannot have curded they cannot have curded
V-ing perfect
I cannot have been curding you cannot have been curding she cannot have been curding we cannot have been curding you cannot have been curding they cannot 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 I not curd? can you not curd? can she not curd? can we not curd? can you not curd? can they not curd?
V-ing form
can I not be curding? can you not be curding? can she not be curding? can we not be curding? can you not be curding? can they not be curding?
Perfect
can I not have curded? can you not have curded? can she not have curded? can we not have curded? can you not have curded? can they not have curded?
V-ing perfect
can I not have been curding? can you not have been curding? can she not have been curding? can we not have been curding? can you not have been curding? can they not have been curding?