Conjugaison du verbe anglais COULD WRITE

I could write
you could write
he could write
we could write
you could write
they could write

I could be writing
you could be writing
he could be writing
we could be writing
you could be writing
they could be writing

I could have written
you could have written
he could have written
we could have written
you could have written
they could have written

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you could have been writing
he could have been writing
we could have been writing
you could have been writing
they could have been writing

I could not write
you could not write
he could not write
we could not write
you could not write
they could not write

I could not be writing
you could not be writing
he could not be writing
we could not be writing
you could not be writing
they could not be writing

I could not have written
you could not have written
he could not have written
we could not have written
you could not have written
they could not have written

I could not have been writing
you could not have been writing
he could not have been writing
we could not have been writing
you could not have been writing
they could not have been writing

could I write?
could you write?
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could they write?

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could you be writing?
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could they be writing?

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could they have written?

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could I not write?
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could they not be writing?

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could they not have written?

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could you not have been writing?
could he not have been writing?
could we not have been writing?
could you not have been writing?
could they not have been writing?