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 can't writhe you can't writhe she can't writhe we can't writhe you can't writhe they can't writhe
V-ing form
I can't be writhing you can't be writhing she can't be writhing we can't be writhing you can't be writhing they can't be writhing
Perfect
I can't have writhed you can't have writhed she can't have writhed we can't have writhed you can't have writhed they can't have writhed
V-ing perfect
I can't have been writhing you can't have been writhing she can't have been writhing we can't have been writhing you can't have been writhing they can't 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't I writhe? can't you writhe? can't she writhe? can't we writhe? can't you writhe? can't they writhe?
V-ing form
can't I be writhing? can't you be writhing? can't she be writhing? can't we be writhing? can't you be writhing? can't they be writhing?
Perfect
can't I have writhed? can't you have writhed? can't she have writhed? can't we have writhed? can't you have writhed? can't they have writhed?
V-ing perfect
can't I have been writhing? can't you have been writhing? can't she have been writhing? can't we have been writhing? can't you have been writhing? can't they have been writhing?