English verb conjugation
CAN TITTER

Regular verb: titter - tittered - tittered

Affirmation

Simple form	V-ing form
I can titter you can titter he can titter we can titter you can titter they can titter	I can be tittering you can be tittering he can be tittering we can be tittering you can be tittering they can be tittering
Perfect	V-ing perfect
I can have tittered you can have tittered he can have tittered we can have tittered you can have tittered they can have tittered	I can have been tittering you can have been tittering he can have been tittering we can have been tittering you can have been tittering they can have been tittering

Negation

Simple form	V-ing form
I cannot titter you cannot titter he cannot titter we cannot titter you cannot titter they cannot titter	I cannot be tittering you cannot be tittering he cannot be tittering we cannot be tittering you cannot be tittering they cannot be tittering
Perfect	V-ing perfect
I cannot have tittered you cannot have tittered he cannot have tittered we cannot have tittered you cannot have tittered they cannot have tittered	I cannot have been tittering you cannot have been tittering he cannot have been tittering we cannot have been tittering you cannot have been tittering they cannot have been tittering

Interrogative form

Simple form	V-ing form
can I titter? can you titter? can he titter? can we titter? can you titter? can they titter?	can I be tittering? can you be tittering? can he be tittering? can we be tittering? can you be tittering? can they be tittering?
Perfect	V-ing perfect
can I have tittered? can you have tittered? can he have tittered? can we have tittered? can you have tittered? can they have tittered?	can I have been tittering? can you have been tittering? can he have been tittering? can we have been tittering? can you have been tittering? can they have been tittering?

Interro-negative form

Simple form	V-ing form
can I not titter? can you not titter? can he not titter? can we not titter? can you not titter? can they not titter?	can I not be tittering? can you not be tittering? can he not be tittering? can we not be tittering? can you not be tittering? can they not be tittering?
Perfect	V-ing perfect
can I not have tittered? can you not have tittered? can he not have tittered? can we not have tittered? can you not have tittered? can they not have tittered?	can I not have been tittering? can you not have been tittering? can he not have been tittering? can we not have been tittering? can you not have been tittering? can they not have been tittering?