I can utter you can utter he can utter we can utter you can utter they can utter
V-ing form
I can be uttering you can be uttering he can be uttering we can be uttering you can be uttering they can be uttering
Perfect
I can have uttered you can have uttered he can have uttered we can have uttered you can have uttered they can have uttered
V-ing perfect
I can have been uttering you can have been uttering he can have been uttering we can have been uttering you can have been uttering they can have been uttering
Negation
Simple form
I cannot utter you cannot utter he cannot utter we cannot utter you cannot utter they cannot utter
V-ing form
I cannot be uttering you cannot be uttering he cannot be uttering we cannot be uttering you cannot be uttering they cannot be uttering
Perfect
I cannot have uttered you cannot have uttered he cannot have uttered we cannot have uttered you cannot have uttered they cannot have uttered
V-ing perfect
I cannot have been uttering you cannot have been uttering he cannot have been uttering we cannot have been uttering you cannot have been uttering they cannot have been uttering
Interrogative form
Simple form
can I utter? can you utter? can he utter? can we utter? can you utter? can they utter?
V-ing form
can I be uttering? can you be uttering? can he be uttering? can we be uttering? can you be uttering? can they be uttering?
Perfect
can I have uttered? can you have uttered? can he have uttered? can we have uttered? can you have uttered? can they have uttered?
V-ing perfect
can I have been uttering? can you have been uttering? can he have been uttering? can we have been uttering? can you have been uttering? can they have been uttering?
Interro-negative form
Simple form
can I not utter? can you not utter? can he not utter? can we not utter? can you not utter? can they not utter?
V-ing form
can I not be uttering? can you not be uttering? can he not be uttering? can we not be uttering? can you not be uttering? can they not be uttering?
Perfect
can I not have uttered? can you not have uttered? can he not have uttered? can we not have uttered? can you not have uttered? can they not have uttered?
V-ing perfect
can I not have been uttering? can you not have been uttering? can he not have been uttering? can we not have been uttering? can you not have been uttering? can they not have been uttering?