I can untwist you can untwist she can untwist we can untwist you can untwist they can untwist
V-ing form
I can be untwisting you can be untwisting she can be untwisting we can be untwisting you can be untwisting they can be untwisting
Perfect
I can have untwisted you can have untwisted she 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 she can have been untwisting we can have been untwisting you can have been untwisting they can have been untwisting
Negation
Simple form
I cannot untwist you cannot untwist she cannot untwist we cannot untwist you cannot untwist they cannot untwist
V-ing form
I cannot be untwisting you cannot be untwisting she cannot be untwisting we cannot be untwisting you cannot be untwisting they cannot be untwisting
Perfect
I cannot have untwisted you cannot have untwisted she cannot have untwisted we cannot have untwisted you cannot have untwisted they cannot have untwisted
V-ing perfect
I cannot have been untwisting you cannot have been untwisting she cannot have been untwisting we cannot have been untwisting you cannot have been untwisting they cannot have been untwisting
Interrogative form
Simple form
can I untwist? can you untwist? can she untwist? can we untwist? can you untwist? can they untwist?
V-ing form
can I be untwisting? can you be untwisting? can she be untwisting? can we be untwisting? can you be untwisting? can they be untwisting?
Perfect
can I have untwisted? can you have untwisted? can she 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 she have been untwisting? can we have been untwisting? can you have been untwisting? can they have been untwisting?
Interro-negative form
Simple form
can I not untwist? can you not untwist? can she not untwist? can we not untwist? can you not untwist? can they not untwist?
V-ing form
can I not be untwisting? can you not be untwisting? can she not be untwisting? can we not be untwisting? can you not be untwisting? can they not be untwisting?
Perfect
can I not have untwisted? can you not have untwisted? can she not have untwisted? can we not have untwisted? can you not have untwisted? can they not have untwisted?
V-ing perfect
can I not have been untwisting? can you not have been untwisting? can she not have been untwisting? can we not have been untwisting? can you not have been untwisting? can they not have been untwisting?