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 can't sigh you can't sigh she can't sigh we can't sigh you can't sigh they can't sigh	I can't be sighing you can't be sighing she can't be sighing we can't be sighing you can't be sighing they can't be sighing
Perfect	V-ing perfect
I can't have sighed you can't have sighed she can't have sighed we can't have sighed you can't have sighed they can't have sighed	I can't have been sighing you can't have been sighing she can't have been sighing we can't have been sighing you can't have been sighing they can't 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't I sigh? can't you sigh? can't she sigh? can't we sigh? can't you sigh? can't they sigh?	can't I be sighing? can't you be sighing? can't she be sighing? can't we be sighing? can't you be sighing? can't they be sighing?
Perfect	V-ing perfect
can't I have sighed? can't you have sighed? can't she have sighed? can't we have sighed? can't you have sighed? can't they have sighed?	can't I have been sighing? can't you have been sighing? can't she have been sighing? can't we have been sighing? can't you have been sighing? can't they have been sighing?