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Future perfect
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Future perfect continuous
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I'd be composing you'd be composing he'd be composing we'd be composing you'd be composing they'd be composing
Past
I'd have composed you'd have composed he'd have composed we'd have composed you'd have composed they'd have composed
Past continuous
I'd have been composing you'd have been composing he'd have been composing we'd have been composing you'd have been composing they'd have been composing