Conjugaison du verbe anglais COULD WRITE

I could write
you could write
she could write
we could write
you could write
they could write

I could be writing
you could be writing
she could be writing
we could be writing
you could be writing
they could be writing

I could have written
you could have written
she could have written
we could have written
you could have written
they could have written

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you could have been writing
she 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
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you could not write
they could not write

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you could not be writing
she could not be writing
we could not be writing
you could not be writing
they could not be writing

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you could not have written
she could not have written
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they could not have written

I could not have been writing
you could not have been writing
she 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 be writing?

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could they have written?

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could they not be writing?

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