English verb conjugation
CAN MUTTER

Regular verb: mutter - muttered - muttered

Affirmation

Simple form	V-ing form
I can mutter you can mutter he can mutter we can mutter you can mutter they can mutter	I can be muttering you can be muttering he can be muttering we can be muttering you can be muttering they can be muttering
Perfect	V-ing perfect
I can have muttered you can have muttered he can have muttered we can have muttered you can have muttered they can have muttered	I can have been muttering you can have been muttering he can have been muttering we can have been muttering you can have been muttering they can have been muttering

Negation

Simple form	V-ing form
I cannot mutter you cannot mutter he cannot mutter we cannot mutter you cannot mutter they cannot mutter	I cannot be muttering you cannot be muttering he cannot be muttering we cannot be muttering you cannot be muttering they cannot be muttering
Perfect	V-ing perfect
I cannot have muttered you cannot have muttered he cannot have muttered we cannot have muttered you cannot have muttered they cannot have muttered	I cannot have been muttering you cannot have been muttering he cannot have been muttering we cannot have been muttering you cannot have been muttering they cannot have been muttering

Interrogative form

Simple form	V-ing form
can I mutter? can you mutter? can he mutter? can we mutter? can you mutter? can they mutter?	can I be muttering? can you be muttering? can he be muttering? can we be muttering? can you be muttering? can they be muttering?
Perfect	V-ing perfect
can I have muttered? can you have muttered? can he have muttered? can we have muttered? can you have muttered? can they have muttered?	can I have been muttering? can you have been muttering? can he have been muttering? can we have been muttering? can you have been muttering? can they have been muttering?

Interro-negative form

Simple form	V-ing form
can I not mutter? can you not mutter? can he not mutter? can we not mutter? can you not mutter? can they not mutter?	can I not be muttering? can you not be muttering? can he not be muttering? can we not be muttering? can you not be muttering? can they not be muttering?
Perfect	V-ing perfect
can I not have muttered? can you not have muttered? can he not have muttered? can we not have muttered? can you not have muttered? can they not have muttered?	can I not have been muttering? can you not have been muttering? can he not have been muttering? can we not have been muttering? can you not have been muttering? can they not have been muttering?