I can untwist you can untwist he can untwist we can untwist you can untwist they can untwist
V-ing form
I can be untwisting you can be untwisting he can be untwisting we can be untwisting you can be untwisting they can be untwisting
Perfect
I can have untwisted you can have untwisted he can have untwisted we can have untwisted you can have untwisted they can have untwisted
V-ing perfect
I can have been untwisting you can have been untwisting he can have been untwisting we can have been untwisting you can have been untwisting they can have been untwisting
Negation
Simple form
I can't untwist you can't untwist he can't untwist we can't untwist you can't untwist they can't untwist
V-ing form
I can't be untwisting you can't be untwisting he can't be untwisting we can't be untwisting you can't be untwisting they can't be untwisting
Perfect
I can't have untwisted you can't have untwisted he can't have untwisted we can't have untwisted you can't have untwisted they can't have untwisted
V-ing perfect
I can't have been untwisting you can't have been untwisting he can't have been untwisting we can't have been untwisting you can't have been untwisting they can't have been untwisting
Interrogative form
Simple form
can I untwist? can you untwist? can he untwist? can we untwist? can you untwist? can they untwist?
V-ing form
can I be untwisting? can you be untwisting? can he be untwisting? can we be untwisting? can you be untwisting? can they be untwisting?
Perfect
can I have untwisted? can you have untwisted? can he have untwisted? can we have untwisted? can you have untwisted? can they have untwisted?
V-ing perfect
can I have been untwisting? can you have been untwisting? can he have been untwisting? can we have been untwisting? can you have been untwisting? can they have been untwisting?
Interro-negative form
Simple form
can't I untwist? can't you untwist? can't he untwist? can't we untwist? can't you untwist? can't they untwist?
V-ing form
can't I be untwisting? can't you be untwisting? can't he be untwisting? can't we be untwisting? can't you be untwisting? can't they be untwisting?
Perfect
can't I have untwisted? can't you have untwisted? can't he have untwisted? can't we have untwisted? can't you have untwisted? can't they have untwisted?
V-ing perfect
can't I have been untwisting? can't you have been untwisting? can't he have been untwisting? can't we have been untwisting? can't you have been untwisting? can't they have been untwisting?