English verb conjugation
CAN SIGH

Regular verb: sigh - sighed - sighed

Affirmation

Simple form	V-ing form
I can sigh you can sigh she can sigh we can sigh you can sigh they can sigh	I can be sighing you can be sighing she can be sighing we can be sighing you can be sighing they can be sighing
Perfect	V-ing perfect
I can have sighed you can have sighed she can have sighed we can have sighed you can have sighed they can have sighed	I can have been sighing you can have been sighing she can have been sighing we can have been sighing you can have been sighing they can have been sighing

Negation

Simple form	V-ing form
I cannot sigh you cannot sigh she cannot sigh we cannot sigh you cannot sigh they cannot sigh	I cannot be sighing you cannot be sighing she cannot be sighing we cannot be sighing you cannot be sighing they cannot be sighing
Perfect	V-ing perfect
I cannot have sighed you cannot have sighed she cannot have sighed we cannot have sighed you cannot have sighed they cannot have sighed	I cannot have been sighing you cannot have been sighing she cannot have been sighing we cannot have been sighing you cannot have been sighing they cannot have been sighing

Interrogative form

Simple form	V-ing form
can I sigh? can you sigh? can she sigh? can we sigh? can you sigh? can they sigh?	can I be sighing? can you be sighing? can she be sighing? can we be sighing? can you be sighing? can they be sighing?
Perfect	V-ing perfect
can I have sighed? can you have sighed? can she have sighed? can we have sighed? can you have sighed? can they have sighed?	can I have been sighing? can you have been sighing? can she have been sighing? can we have been sighing? can you have been sighing? can they have been sighing?

Interro-negative form

Simple form	V-ing form
can I not sigh? can you not sigh? can she not sigh? can we not sigh? can you not sigh? can they not sigh?	can I not be sighing? can you not be sighing? can she not be sighing? can we not be sighing? can you not be sighing? can they not be sighing?
Perfect	V-ing perfect
can I not have sighed? can you not have sighed? can she not have sighed? can we not have sighed? can you not have sighed? can they not have sighed?	can I not have been sighing? can you not have been sighing? can she not have been sighing? can we not have been sighing? can you not have been sighing? can they not have been sighing?