English verb conjugation COULD SUSTAIN

Regular verb: sustain - sustained - sustained

Affirmation

Simple form

I could sustain
you could sustain
he could sustain
we could sustain
you could sustain
they could sustain

V-ing form

I could be sustaining
you could be sustaining
he could be sustaining
we could be sustaining
you could be sustaining
they could be sustaining

Perfect

I could have sustained
you could have sustained
he could have sustained
we could have sustained
you could have sustained
they could have sustained

V-ing perfect

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

Negation

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I sustain?
could you sustain?
could he sustain?
could we sustain?
could you sustain?
could they sustain?

V-ing form

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

Perfect

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

V-ing perfect

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

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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