I can tiptoe you can tiptoe he can tiptoe we can tiptoe you can tiptoe they can tiptoe
V-ing form
I can be tiptoing you can be tiptoing he can be tiptoing we can be tiptoing you can be tiptoing they can be tiptoing
Perfect
I can have tiptoed you can have tiptoed he can have tiptoed we can have tiptoed you can have tiptoed they can have tiptoed
V-ing perfect
I can have been tiptoing you can have been tiptoing he can have been tiptoing we can have been tiptoing you can have been tiptoing they can have been tiptoing
Negation
Simple form
I can't tiptoe you can't tiptoe he can't tiptoe we can't tiptoe you can't tiptoe they can't tiptoe
V-ing form
I can't be tiptoing you can't be tiptoing he can't be tiptoing we can't be tiptoing you can't be tiptoing they can't be tiptoing
Perfect
I can't have tiptoed you can't have tiptoed he can't have tiptoed we can't have tiptoed you can't have tiptoed they can't have tiptoed
V-ing perfect
I can't have been tiptoing you can't have been tiptoing he can't have been tiptoing we can't have been tiptoing you can't have been tiptoing they can't have been tiptoing
Interrogative form
Simple form
can I tiptoe? can you tiptoe? can he tiptoe? can we tiptoe? can you tiptoe? can they tiptoe?
V-ing form
can I be tiptoing? can you be tiptoing? can he be tiptoing? can we be tiptoing? can you be tiptoing? can they be tiptoing?
Perfect
can I have tiptoed? can you have tiptoed? can he have tiptoed? can we have tiptoed? can you have tiptoed? can they have tiptoed?
V-ing perfect
can I have been tiptoing? can you have been tiptoing? can he have been tiptoing? can we have been tiptoing? can you have been tiptoing? can they have been tiptoing?
Interro-negative form
Simple form
can't I tiptoe? can't you tiptoe? can't he tiptoe? can't we tiptoe? can't you tiptoe? can't they tiptoe?
V-ing form
can't I be tiptoing? can't you be tiptoing? can't he be tiptoing? can't we be tiptoing? can't you be tiptoing? can't they be tiptoing?
Perfect
can't I have tiptoed? can't you have tiptoed? can't he have tiptoed? can't we have tiptoed? can't you have tiptoed? can't they have tiptoed?
V-ing perfect
can't I have been tiptoing? can't you have been tiptoing? can't he have been tiptoing? can't we have been tiptoing? can't you have been tiptoing? can't they have been tiptoing?