English verb conjugation
CAN SIEVE

Regular verb: sieve - sieved - sieved

Affirmation

Simple form	V-ing form
I can sieve you can sieve she can sieve we can sieve you can sieve they can sieve	I can be sieving you can be sieving she can be sieving we can be sieving you can be sieving they can be sieving
Perfect	V-ing perfect
I can have sieved you can have sieved she can have sieved we can have sieved you can have sieved they can have sieved	I can have been sieving you can have been sieving she can have been sieving we can have been sieving you can have been sieving they can have been sieving

Negation

Simple form	V-ing form
I can't sieve you can't sieve she can't sieve we can't sieve you can't sieve they can't sieve	I can't be sieving you can't be sieving she can't be sieving we can't be sieving you can't be sieving they can't be sieving
Perfect	V-ing perfect
I can't have sieved you can't have sieved she can't have sieved we can't have sieved you can't have sieved they can't have sieved	I can't have been sieving you can't have been sieving she can't have been sieving we can't have been sieving you can't have been sieving they can't have been sieving

Interrogative form

Simple form	V-ing form
can I sieve? can you sieve? can she sieve? can we sieve? can you sieve? can they sieve?	can I be sieving? can you be sieving? can she be sieving? can we be sieving? can you be sieving? can they be sieving?
Perfect	V-ing perfect
can I have sieved? can you have sieved? can she have sieved? can we have sieved? can you have sieved? can they have sieved?	can I have been sieving? can you have been sieving? can she have been sieving? can we have been sieving? can you have been sieving? can they have been sieving?

Interro-negative form

Simple form	V-ing form
can't I sieve? can't you sieve? can't she sieve? can't we sieve? can't you sieve? can't they sieve?	can't I be sieving? can't you be sieving? can't she be sieving? can't we be sieving? can't you be sieving? can't they be sieving?
Perfect	V-ing perfect
can't I have sieved? can't you have sieved? can't she have sieved? can't we have sieved? can't you have sieved? can't they have sieved?	can't I have been sieving? can't you have been sieving? can't she have been sieving? can't we have been sieving? can't you have been sieving? can't they have been sieving?