English verb conjugation
CAN SIEVE

Regular verb: sieve - sieved - sieved

Affirmation

Simple form	V-ing form
I can sieve you can sieve he can sieve we can sieve you can sieve they can sieve	I can be sieving you can be sieving he 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 he 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 he 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 cannot sieve you cannot sieve he cannot sieve we cannot sieve you cannot sieve they cannot sieve	I cannot be sieving you cannot be sieving he cannot be sieving we cannot be sieving you cannot be sieving they cannot be sieving
Perfect	V-ing perfect
I cannot have sieved you cannot have sieved he cannot have sieved we cannot have sieved you cannot have sieved they cannot have sieved	I cannot have been sieving you cannot have been sieving he cannot have been sieving we cannot have been sieving you cannot have been sieving they cannot have been sieving

Interrogative form

Simple form	V-ing form
can I sieve? can you sieve? can he sieve? can we sieve? can you sieve? can they sieve?	can I be sieving? can you be sieving? can he 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 he 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 he 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 I not sieve? can you not sieve? can he not sieve? can we not sieve? can you not sieve? can they not sieve?	can I not be sieving? can you not be sieving? can he not be sieving? can we not be sieving? can you not be sieving? can they not be sieving?
Perfect	V-ing perfect
can I not have sieved? can you not have sieved? can he not have sieved? can we not have sieved? can you not have sieved? can they not have sieved?	can I not have been sieving? can you not have been sieving? can he not have been sieving? can we not have been sieving? can you not have been sieving? can they not have been sieving?