I can writhe you can writhe she can writhe we can writhe you can writhe they can writhe
V-ing form
I can be writhing you can be writhing she can be writhing we can be writhing you can be writhing they can be writhing
Perfect
I can have writhed you can have writhed she can have writhed we can have writhed you can have writhed they can have writhed
V-ing perfect
I can have been writhing you can have been writhing she can have been writhing we can have been writhing you can have been writhing they can have been writhing
Negation
Simple form
I cannot writhe you cannot writhe she cannot writhe we cannot writhe you cannot writhe they cannot writhe
V-ing form
I cannot be writhing you cannot be writhing she cannot be writhing we cannot be writhing you cannot be writhing they cannot be writhing
Perfect
I cannot have writhed you cannot have writhed she cannot have writhed we cannot have writhed you cannot have writhed they cannot have writhed
V-ing perfect
I cannot have been writhing you cannot have been writhing she cannot have been writhing we cannot have been writhing you cannot have been writhing they cannot have been writhing
Interrogative form
Simple form
can I writhe? can you writhe? can she writhe? can we writhe? can you writhe? can they writhe?
V-ing form
can I be writhing? can you be writhing? can she be writhing? can we be writhing? can you be writhing? can they be writhing?
Perfect
can I have writhed? can you have writhed? can she have writhed? can we have writhed? can you have writhed? can they have writhed?
V-ing perfect
can I have been writhing? can you have been writhing? can she have been writhing? can we have been writhing? can you have been writhing? can they have been writhing?
Interro-negative form
Simple form
can I not writhe? can you not writhe? can she not writhe? can we not writhe? can you not writhe? can they not writhe?
V-ing form
can I not be writhing? can you not be writhing? can she not be writhing? can we not be writhing? can you not be writhing? can they not be writhing?
Perfect
can I not have writhed? can you not have writhed? can she not have writhed? can we not have writhed? can you not have writhed? can they not have writhed?
V-ing perfect
can I not have been writhing? can you not have been writhing? can she not have been writhing? can we not have been writhing? can you not have been writhing? can they not have been writhing?