English verb conjugation COULD SIEVE

Regular verb: sieve - sieved - sieved

Affirmation

Simple form

I could sieve
you could sieve
he could sieve
we could sieve
you could sieve
they could sieve

V-ing form

I could be sieving
you could be sieving
he could be sieving
we could be sieving
you could be sieving
they could be sieving

Perfect

I could have sieved
you could have sieved
he could have sieved
we could have sieved
you could have sieved
they could have sieved

V-ing perfect

I could have been sieving
you could have been sieving
he could have been sieving
we could have been sieving
you could have been sieving
they could have been sieving

Negation

Simple form

I couldn't sieve
you couldn't sieve
he couldn't sieve
we couldn't sieve
you couldn't sieve
they couldn't sieve

V-ing form

I couldn't be sieving
you couldn't be sieving
he couldn't be sieving
we couldn't be sieving
you couldn't be sieving
they couldn't be sieving

Perfect

I couldn't have sieved
you couldn't have sieved
he couldn't have sieved
we couldn't have sieved
you couldn't have sieved
they couldn't have sieved

V-ing perfect

I couldn't have been sieving
you couldn't have been sieving
he couldn't have been sieving
we couldn't have been sieving
you couldn't have been sieving
they couldn't have been sieving

Interrogative form

Simple form

could I sieve?
could you sieve?
could he sieve?
could we sieve?
could you sieve?
could they sieve?

V-ing form

could I be sieving?
could you be sieving?
could he be sieving?
could we be sieving?
could you be sieving?
could they be sieving?

Perfect

could I have sieved?
could you have sieved?
could he have sieved?
could we have sieved?
could you have sieved?
could they have sieved?

V-ing perfect

could I have been sieving?
could you have been sieving?
could he have been sieving?
could we have been sieving?
could you have been sieving?
could they have been sieving?

Interro-negative form

Simple form

couldn't I sieve?
couldn't you sieve?
couldn't he sieve?
couldn't we sieve?
couldn't you sieve?
couldn't they sieve?

V-ing form

couldn't I be sieving?
couldn't you be sieving?
couldn't he be sieving?
couldn't we be sieving?
couldn't you be sieving?
couldn't they be sieving?

Perfect

couldn't I have sieved?
couldn't you have sieved?
couldn't he have sieved?
couldn't we have sieved?
couldn't you have sieved?
couldn't they have sieved?

V-ing perfect

couldn't I have been sieving?
couldn't you have been sieving?
couldn't he have been sieving?
couldn't we have been sieving?
couldn't you have been sieving?
couldn't they have been sieving?

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