English verb conjugation
CAN SIFT

Regular verb: sift - sifted - sifted

Affirmation

Simple form	V-ing form
I can sift you can sift she can sift we can sift you can sift they can sift	I can be sifting you can be sifting she can be sifting we can be sifting you can be sifting they can be sifting
Perfect	V-ing perfect
I can have sifted you can have sifted she can have sifted we can have sifted you can have sifted they can have sifted	I can have been sifting you can have been sifting she can have been sifting we can have been sifting you can have been sifting they can have been sifting

Negation

Simple form	V-ing form
I can't sift you can't sift she can't sift we can't sift you can't sift they can't sift	I can't be sifting you can't be sifting she can't be sifting we can't be sifting you can't be sifting they can't be sifting
Perfect	V-ing perfect
I can't have sifted you can't have sifted she can't have sifted we can't have sifted you can't have sifted they can't have sifted	I can't have been sifting you can't have been sifting she can't have been sifting we can't have been sifting you can't have been sifting they can't have been sifting

Interrogative form

Simple form	V-ing form
can I sift? can you sift? can she sift? can we sift? can you sift? can they sift?	can I be sifting? can you be sifting? can she be sifting? can we be sifting? can you be sifting? can they be sifting?
Perfect	V-ing perfect
can I have sifted? can you have sifted? can she have sifted? can we have sifted? can you have sifted? can they have sifted?	can I have been sifting? can you have been sifting? can she have been sifting? can we have been sifting? can you have been sifting? can they have been sifting?

Interro-negative form

Simple form	V-ing form
can't I sift? can't you sift? can't she sift? can't we sift? can't you sift? can't they sift?	can't I be sifting? can't you be sifting? can't she be sifting? can't we be sifting? can't you be sifting? can't they be sifting?
Perfect	V-ing perfect
can't I have sifted? can't you have sifted? can't she have sifted? can't we have sifted? can't you have sifted? can't they have sifted?	can't I have been sifting? can't you have been sifting? can't she have been sifting? can't we have been sifting? can't you have been sifting? can't they have been sifting?