Conjugaison du verbe anglais COULD SUSTAIN

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

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

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

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

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

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

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

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

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

could I be sustaining?
could you be sustaining?
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could I have sustained?
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could they have sustained?

could I have been sustaining?
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could they have been sustaining?

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

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couldn't I have sustained?
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couldn't they have sustained?

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couldn't you have been sustaining?
couldn't they have been sustaining?