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 can't sieve you can't sieve he 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 he 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 he 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 he 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 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't I sieve? can't you sieve? can't he 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 he 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 he 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 he have been sieving? can't we have been sieving? can't you have been sieving? can't they have been sieving?