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To sit in the garden, I saw a flock of birds fly overhead.

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cobra file 965To sit in the garden, I saw a flock of birds fly overhead.

This doesn't make sense. It means that you saw the birds for the purpose of sitting in the garden. Emotion: tongue tied I think you could have sat in the garden without seeing the birds.

You might mean

Sitting in the garden, I saw a flock of birds fly overhead.

That's While I was sitting in the garden, I saw ....

CJ